31161612870 has 96 divisors (see below), whose sum is σ = 85445418240. Its totient is φ = 8168882400.

The previous prime is 31161612869. The next prime is 31161612907. The reversal of 31161612870 is 7821616113.

31161612870 is a `hidden beast` number, since 3 + 11 + 616 + 1 + 28 + 7 + 0 = 666.

It is a super-2 number, since 2×31161612870² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 34695 + ... + 252045.

It is an arithmetic number, because the mean of its divisors is an integer number (890056440).

Almost surely, 2^31161612870 is an apocalyptic number.

31161612870 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 31161612870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42722709120).

31161612870 is an abundant number, since it is smaller than the sum of its proper divisors (54283805370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31161612870 is a wasteful number, since it uses less digits than its factorization.

31161612870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217432 (or 217420 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The spelling of 31161612870 in words is "thirty-one billion, one hundred sixty-one million, six hundred twelve thousand, eight hundred seventy".