31021272 has 32 divisors (see below), whose sum is σ = 86170800. Its totient is φ = 10340352.

The previous prime is 31021267. The next prime is 31021283. The reversal of 31021272 is 27212013.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 71593 + ... + 72024.

Almost surely, 2^31021272 is an apocalyptic number.

It is an amenable number.

31021272 is an abundant number, since it is smaller than the sum of its proper divisors (55149528).

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

31021272 is a wasteful number, since it uses less digits than its factorization.

31021272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143632 (or 143622 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 31021272 is about 5569.6743172290. The cubic root of 31021272 is about 314.2099019816.

Adding to 31021272 its reverse (27212013), we get a palindrome (58233285).

The spelling of 31021272 in words is "thirty-one million, twenty-one thousand, two hundred seventy-two".