31130965 has 8 divisors (see below), whose sum is σ = 37388088. Its totient is φ = 24884160.

The previous prime is 31130959. The next prime is 31130989. The reversal of 31130965 is 56903113.

It can be written as a sum of positive squares in 4 ways, for example, as 8720209 + 22410756 = 2953^2 + 4734^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31130965 - 2⁵ = 31130933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 8055 + ... + 11275.

It is an arithmetic number, because the mean of its divisors is an integer number (4673511).

Almost surely, 2^31130965 is an apocalyptic number.

It is an amenable number.

31130965 is a deficient number, since it is larger than the sum of its proper divisors (6257123).

31130965 is a wasteful number, since it uses less digits than its factorization.

31130965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5159.

The product of its (nonzero) digits is 2430, while the sum is 28.

The square root of 31130965 is about 5579.5129715774. The cubic root of 31130965 is about 314.5798210603.

The spelling of 31130965 in words is "thirty-one million, one hundred thirty thousand, nine hundred sixty-five".