31261972 has 12 divisors (see below), whose sum is σ = 62524000. Its totient is φ = 13397976.

The previous prime is 31261949. The next prime is 31261987. The reversal of 31261972 is 27916213.

31261972 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 558222 + ... + 558277.

Almost surely, 2^31261972 is an apocalyptic number.

It is an amenable number.

31261972 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

31261972 is a wasteful number, since it uses less digits than its factorization.

31261972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1116510 (or 1116508 counting only the distinct ones).

The product of its digits is 4536, while the sum is 31.

The square root of 31261972 is about 5591.2406494445. The cubic root of 31261972 is about 315.0204807377.

The spelling of 31261972 in words is "thirty-one million, two hundred sixty-one thousand, nine hundred seventy-two".