31051312 has 20 divisors (see below), whose sum is σ = 60527376. Its totient is φ = 15431360.

The previous prime is 31051291. The next prime is 31051411. The reversal of 31051312 is 21315013.

It is a Harshad number since it is a multiple of its sum of digits (16).

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 3 ways as a sum of consecutive naturals, for example, 3139 + ... + 8482.

Almost surely, 2^31051312 is an apocalyptic number.

It is an amenable number.

31051312 is a deficient number, since it is larger than the sum of its proper divisors (29476064).

31051312 is a wasteful number, since it uses less digits than its factorization.

31051312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11796 (or 11790 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 31051312 is about 5572.3704112343. The cubic root of 31051312 is about 314.3112928415.

Adding to 31051312 its reverse (21315013), we get a palindrome (52366325).

The spelling of 31051312 in words is "thirty-one million, fifty-one thousand, three hundred twelve".