31161256 has 24 divisors (see below), whose sum is σ = 67967370. Its totient is φ = 13354656.

The previous prime is 31161241. The next prime is 31161257. The reversal of 31161256 is 65216113.

It can be written as a sum of positive squares in only one way, i.e., 20702500 + 10458756 = 4550^2 + 3234^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31161256.

It is not an unprimeable number, because it can be changed into a prime (31161257) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 39355 + ... + 40138.

Almost surely, 2^31161256 is an apocalyptic number.

It is an amenable number.

31161256 is an abundant number, since it is smaller than the sum of its proper divisors (36806114).

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

31161256 is a wasteful number, since it uses less digits than its factorization.

31161256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79513 (or 79502 counting only the distinct ones).

The product of its digits is 1080, while the sum is 25.

The square root of 31161256 is about 5582.2267958226. The cubic root of 31161256 is about 314.6818186310.

Adding to 31161256 its reverse (65216113), we get a palindrome (96377369).

The spelling of 31161256 in words is "thirty-one million, one hundred sixty-one thousand, two hundred fifty-six".