31861707113 has 4 divisors (see below), whose sum is σ = 31865372628. Its totient is φ = 31858041600.

The previous prime is 31861707091. The next prime is 31861707127. The reversal of 31861707113 is 31170716813.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20164852009 + 11696855104 = 142003^2 + 108152^2 .

It is a cyclic number.

It is not a de Polignac number, because 31861707113 - 2¹⁰ = 31861706089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31861700113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1819688 + ... + 1837113.

It is an arithmetic number, because the mean of its divisors is an integer number (7966343157).

Almost surely, 2^31861707113 is an apocalyptic number.

It is an amenable number.

31861707113 is a deficient number, since it is larger than the sum of its proper divisors (3665515).

31861707113 is an equidigital number, since it uses as much as digits as its factorization.

31861707113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3665514.

The product of its (nonzero) digits is 21168, while the sum is 38.

The spelling of 31861707113 in words is "thirty-one billion, eight hundred sixty-one million, seven hundred seven thousand, one hundred thirteen".