31178687113 has 24 divisors (see below), whose sum is σ = 36849225024. Its totient is φ = 26297964000.

The previous prime is 31178687077. The next prime is 31178687117.

31178687113 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 31178687113 - 2¹⁷ = 31178556041 is a prime.

It is a super-2 number, since 2×31178687113² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31178687117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3478788 + ... + 3487738.

It is an arithmetic number, because the mean of its divisors is an integer number (1535384376).

Almost surely, 2^31178687113 is an apocalyptic number.

It is an amenable number.

31178687113 is a deficient number, since it is larger than the sum of its proper divisors (5670537911).

31178687113 is a wasteful number, since it uses less digits than its factorization.

31178687113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10093 (or 10086 counting only the distinct ones).

The product of its digits is 169344, while the sum is 46.

The spelling of 31178687113 in words is "thirty-one billion, one hundred seventy-eight million, six hundred eighty-seven thousand, one hundred thirteen".