31213372 has 6 divisors (see below), whose sum is σ = 54623408. Its totient is φ = 15606684.

The previous prime is 31213363. The next prime is 31213393. The reversal of 31213372 is 27331213.

It is a happy number.

It is a super-2 number, since 2×31213372² = 1948549183220768, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3901668 + ... + 3901675.

Almost surely, 2^31213372 is an apocalyptic number.

It is an amenable number.

31213372 is a deficient number, since it is larger than the sum of its proper divisors (23410036).

31213372 is a wasteful number, since it uses less digits than its factorization.

31213372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7803347 (or 7803345 counting only the distinct ones).

The product of its digits is 756, while the sum is 22.

The square root of 31213372 is about 5586.8928752930. The cubic root of 31213372 is about 314.8571519935.

Adding to 31213372 its reverse (27331213), we get a palindrome (58544585).

The spelling of 31213372 in words is "thirty-one million, two hundred thirteen thousand, three hundred seventy-two".