31161646431 has 48 divisors (see below), whose sum is σ = 47827964160. Its totient is φ = 20051506800.

The previous prime is 31161646427. The next prime is 31161646469. The reversal of 31161646431 is 13464616113.

31161646431 is a `hidden beast` number, since 3 + 1 + 1 + 6 + 1 + 6 + 4 + 643 + 1 = 666.

It is not a de Polignac number, because 31161646431 - 2² = 31161646427 is a prime.

It is a super-2 number, since 2×31161646431² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31161646421) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11493166 + ... + 11495876.

It is an arithmetic number, because the mean of its divisors is an integer number (996415920).

Almost surely, 2^31161646431 is an apocalyptic number.

31161646431 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

31161646431 is a deficient number, since it is larger than the sum of its proper divisors (16666317729).

31161646431 is a wasteful number, since it uses less digits than its factorization.

31161646431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3225 (or 3188 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The spelling of 31161646431 in words is "thirty-one billion, one hundred sixty-one million, six hundred forty-six thousand, four hundred thirty-one".