31147212 has 12 divisors (see below), whose sum is σ = 72676856. Its totient is φ = 10382400.

The previous prime is 31147201. The next prime is 31147217. The reversal of 31147212 is 21274113.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (31147217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1297789 + ... + 1297812.

Almost surely, 2^31147212 is an apocalyptic number.

It is an amenable number.

31147212 is an abundant number, since it is smaller than the sum of its proper divisors (41529644).

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

31147212 is a wasteful number, since it uses less digits than its factorization.

31147212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2595608 (or 2595606 counting only the distinct ones).

The product of its digits is 336, while the sum is 21.

The square root of 31147212 is about 5580.9687331144. The cubic root of 31147212 is about 314.6345371014.

The spelling of 31147212 in words is "thirty-one million, one hundred forty-seven thousand, two hundred twelve".