Egypt and Saudi have strengthened ties since Sisi took power after ousting the Muslim Brotherhood in 2013.
The countries signed agreements to "activate" a 60 billion Saudi riyal ($16 billion) investment fund they agreed to set up in 2016, and another deal on environmental protection, at a short televised ceremony attended by the two leaders.
Saudi Crown Prince expected to visit U.S. March 19-22: source
The details of the agreements were not immediately given. Cairo supports Riyadh in its fight against Iran-backed Houthi fighters in Yemen, and last year joined a Saudi-led boycott of Gulf state Qatar and agreed to hand over two Red Sea islands to Saudi despite widespread criticism at home.
The day before Prince Mohammed's visit, Egypt's top court dismissed all outstanding legal challenges to the deal on the Red Sea islands.
The Saudi visit comes three weeks ahead of an election where former general Sisi is seeking a second term.
Sisi is guaranteed a win in a vote where, critics say, authorities have locked up opponents or forced them to halt election campaigns.
Saudi crown prince says reforms aimed at 'cancer' of corruption
As Egypt tries to keep a lid on any internal unrest, it has sided firmly with Saudi Arabia on key foreign policy issues including the face-off between the Kingdom and its foe Iran. Egypt eagerly joined the trade and diplomatic boycott of
Qatar, whose government and media it accuses of supported the now banned Muslim Brotherhood, hundreds of whose members Cairo has imprisoned and sentenced to death.
The Saudi prince will head to Britain on March 7 following his three-day visit to Cairo and then to the United States, Riyadh's closest Western ally, later in the month.
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