31517132 has 12 divisors (see below), whose sum is σ = 55661760. Its totient is φ = 15613776.

The previous prime is 31517063. The next prime is 31517149. The reversal of 31517132 is 23171513.

It is a junction number, because it is equal to n+sod(n) for n = 31517098 and 31517107.

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, 35708 + ... + 36579.

It is an arithmetic number, because the mean of its divisors is an integer number (4638480).

Almost surely, 2^31517132 is an apocalyptic number.

It is an amenable number.

31517132 is a deficient number, since it is larger than the sum of its proper divisors (24144628).

31517132 is a wasteful number, since it uses less digits than its factorization.

31517132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72400 (or 72398 counting only the distinct ones).

The product of its digits is 630, while the sum is 23.

The square root of 31517132 is about 5614.0121125626. The cubic root of 31517132 is about 315.8752244652.

Adding to 31517132 its reverse (23171513), we get a palindrome (54688645).

The spelling of 31517132 in words is "thirty-one million, five hundred seventeen thousand, one hundred thirty-two".