799707991 has 2 divisors, whose sum is σ = 799707992. Its totient is φ = 799707990.

The previous prime is 799707977. The next prime is 799708069. The reversal of 799707991 is 199707997.

It is a weak prime.

It is an emirp because it is prime and its reverse (199707997) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 799707991 - 2¹⁹ = 799183703 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (799707901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 399853995 + 399853996.

It is an arithmetic number, because the mean of its divisors is an integer number (399853996).

Almost surely, 2^799707991 is an apocalyptic number.

799707991 is a deficient number, since it is larger than the sum of its proper divisors (1).

799707991 is an equidigital number, since it uses as much as digits as its factorization.

799707991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2250423, while the sum is 58.

The square root of 799707991 is about 28279.1087377237. The cubic root of 799707991 is about 928.2048041678.

The spelling of 799707991 in words is "seven hundred ninety-nine million, seven hundred seven thousand, nine hundred ninety-one".