31130256 has 40 divisors (see below), whose sum is σ = 80619840. Its totient is φ = 10350976.

The previous prime is 31130251. The next prime is 31130261. The reversal of 31130256 is 65203113.

It is an interprime number because it is at equal distance from previous prime (31130251) and next prime (31130261).

It is not an unprimeable number, because it can be changed into a prime (31130251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36685 + ... + 37523.

It is an arithmetic number, because the mean of its divisors is an integer number (2015496).

Almost surely, 2^31130256 is an apocalyptic number.

It is an amenable number.

31130256 is an abundant number, since it is smaller than the sum of its proper divisors (49489584).

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

31130256 is a wasteful number, since it uses less digits than its factorization.

31130256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1623 (or 1617 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 31130256 is about 5579.4494352042. The cubic root of 31130256 is about 314.5774328830.

Adding to 31130256 its reverse (65203113), we get a palindrome (96333369).

The spelling of 31130256 in words is "thirty-one million, one hundred thirty thousand, two hundred fifty-six".