77922431 has 2 divisors, whose sum is σ = 77922432. Its totient is φ = 77922430.

The previous prime is 77922389. The next prime is 77922457. The reversal of 77922431 is 13422977.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77922431 - 2¹⁰ = 77921407 is a prime.

It is a super-2 number, since 2×77922431² = 12143810505899522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is equal to p_4555295 and since 77922431 and 4555295 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 77922391 and 77922400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77922631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38961215 + 38961216.

It is an arithmetic number, because the mean of its divisors is an integer number (38961216).

Almost surely, 2^77922431 is an apocalyptic number.

77922431 is a deficient number, since it is larger than the sum of its proper divisors (1).

77922431 is an equidigital number, since it uses as much as digits as its factorization.

77922431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 35.

The square root of 77922431 is about 8827.3682941180. The cubic root of 77922431 is about 427.1241862096.

The spelling of 77922431 in words is "seventy-seven million, nine hundred twenty-two thousand, four hundred thirty-one".