31121252 has 12 divisors (see below), whose sum is σ = 54520956. Its totient is φ = 15543840.

The previous prime is 31121249. The next prime is 31121267. The reversal of 31121252 is 25212113.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 7540516 + 23580736 = 2746^2 + 4856^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31121252.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 578 + ... + 7910.

It is an arithmetic number, because the mean of its divisors is an integer number (4543413).

Almost surely, 2^31121252 is an apocalyptic number.

It is an amenable number.

31121252 is a deficient number, since it is larger than the sum of its proper divisors (23399704).

31121252 is a wasteful number, since it uses less digits than its factorization.

31121252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8398 (or 8396 counting only the distinct ones).

The product of its digits is 120, while the sum is 17.

The square root of 31121252 is about 5578.6424872006. The cubic root of 31121252 is about 314.5471008877.

Adding to 31121252 its reverse (25212113), we get a palindrome (56333365).

The spelling of 31121252 in words is "thirty-one million, one hundred twenty-one thousand, two hundred fifty-two".