797407991 has 2 divisors, whose sum is σ = 797407992. Its totient is φ = 797407990.

The previous prime is 797407973. The next prime is 797407993. The reversal of 797407991 is 199704797.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 797407991 - 2⁶ = 797407927 is a prime.

It is a super-2 number, since 2×797407991² = 1271719008221312162, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 797407993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (797407993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 398703995 + 398703996.

It is an arithmetic number, because the mean of its divisors is an integer number (398703996).

Almost surely, 2^797407991 is an apocalyptic number.

797407991 is a deficient number, since it is larger than the sum of its proper divisors (1).

797407991 is an equidigital number, since it uses as much as digits as its factorization.

797407991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1000188, while the sum is 53.

The square root of 797407991 is about 28238.4133938152. The cubic root of 797407991 is about 927.3140953027.

The spelling of 797407991 in words is "seven hundred ninety-seven million, four hundred seven thousand, nine hundred ninety-one".