31201312 has 24 divisors (see below), whose sum is σ = 62589996. Its totient is φ = 15305472.

The previous prime is 31201309. The next prime is 31201321. The reversal of 31201312 is 21310213.

It can be written as a sum of positive squares in 2 ways, for example, as 27499536 + 3701776 = 5244^2 + 1924^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31201292 and 31201301.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7503 + ... + 10894.

Almost surely, 2^31201312 is an apocalyptic number.

31201312 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31201312 is an abundant number, since it is smaller than the sum of its proper divisors (31388684).

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

31201312 is a wasteful number, since it uses less digits than its factorization.

31201312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18460 (or 18452 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 31201312 is about 5585.8134591123. The cubic root of 31201312 is about 314.8165960164.

Adding to 31201312 its reverse (21310213), we get a palindrome (52511525).

It can be divided in two parts, 31201 and 312, that added together give a palindrome (31513).

The spelling of 31201312 in words is "thirty-one million, two hundred one thousand, three hundred twelve".