31213132 has 6 divisors (see below), whose sum is σ = 54622988. Its totient is φ = 15606564.

The previous prime is 31213129. The next prime is 31213157. The reversal of 31213132 is 23131213.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3901638 + ... + 3901645.

Almost surely, 2^31213132 is an apocalyptic number.

It is an amenable number.

31213132 is a deficient number, since it is larger than the sum of its proper divisors (23409856).

31213132 is a wasteful number, since it uses less digits than its factorization.

31213132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7803287 (or 7803285 counting only the distinct ones).

The product of its digits is 108, while the sum is 16.

The square root of 31213132 is about 5586.8713964078. The cubic root of 31213132 is about 314.8563450113.

Adding to 31213132 its reverse (23131213), we get a palindrome (54344345).

The spelling of 31213132 in words is "thirty-one million, two hundred thirteen thousand, one hundred thirty-two".