76991031 has 12 divisors (see below), whose sum is σ = 119764008. Its totient is φ = 47379024.

The previous prime is 76991023. The next prime is 76991053. The reversal of 76991031 is 13019967.

It is not a de Polignac number, because 76991031 - 2³ = 76991023 is a prime.

It is a super-2 number, since 2×76991031² = 11855237708885922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76991231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 328905 + ... + 329138.

It is an arithmetic number, because the mean of its divisors is an integer number (9980334).

Almost surely, 2^76991031 is an apocalyptic number.

76991031 is a deficient number, since it is larger than the sum of its proper divisors (42772977).

76991031 is a wasteful number, since it uses less digits than its factorization.

76991031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658062 (or 658059 counting only the distinct ones).

The product of its (nonzero) digits is 10206, while the sum is 36.

The square root of 76991031 is about 8774.4533163041. The cubic root of 76991031 is about 425.4155676866.

The spelling of 76991031 in words is "seventy-six million, nine hundred ninety-one thousand, thirty-one".