77975431 has 2 divisors, whose sum is σ = 77975432. Its totient is φ = 77975430.

The previous prime is 77975393. The next prime is 77975437. The reversal of 77975431 is 13457977.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77975431 - 2¹¹ = 77973383 is a prime.

It is a super-2 number, since 2×77975431² = 12160335679271522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77975437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38987715 + 38987716.

It is an arithmetic number, because the mean of its divisors is an integer number (38987716).

Almost surely, 2^77975431 is an apocalyptic number.

77975431 is a deficient number, since it is larger than the sum of its proper divisors (1).

77975431 is an equidigital number, since it uses as much as digits as its factorization.

77975431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 185220, while the sum is 43.

The square root of 77975431 is about 8830.3698110555. The cubic root of 77975431 is about 427.2210023685.

The spelling of 77975431 in words is "seventy-seven million, nine hundred seventy-five thousand, four hundred thirty-one".