31317132 has 48 divisors (see below), whose sum is σ = 91107072. Its totient is φ = 8134080.

The previous prime is 31317131. The next prime is 31317157. The reversal of 31317132 is 23171313.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 31317099 and 31317108.

It is not an unprimeable number, because it can be changed into a prime (31317131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16023 + ... + 17870.

It is an arithmetic number, because the mean of its divisors is an integer number (1898064).

Almost surely, 2^31317132 is an apocalyptic number.

It is an amenable number.

31317132 is an abundant number, since it is smaller than the sum of its proper divisors (59789940).

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

31317132 is a wasteful number, since it uses less digits than its factorization.

31317132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33918 (or 33916 counting only the distinct ones).

The product of its digits is 378, while the sum is 21.

The square root of 31317132 is about 5596.1711910913. The cubic root of 31317132 is about 315.2056505425.

Adding to 31317132 its reverse (23171313), we get a palindrome (54488445).

The spelling of 31317132 in words is "thirty-one million, three hundred seventeen thousand, one hundred thirty-two".