31331132 has 12 divisors (see below), whose sum is σ = 62662320. Its totient is φ = 13427616.

The previous prime is 31331117. The next prime is 31331137. The reversal of 31331132 is 23113313.

31331132 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 31331132.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31331137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 559457 + ... + 559512.

It is an arithmetic number, because the mean of its divisors is an integer number (5221860).

Almost surely, 2^31331132 is an apocalyptic number.

It is an amenable number.

31331132 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

31331132 is a wasteful number, since it uses less digits than its factorization.

31331132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1118980 (or 1118978 counting only the distinct ones).

The product of its digits is 162, while the sum is 17.

The square root of 31331132 is about 5597.4219065566. The cubic root of 31331132 is about 315.2526133539.

Adding to 31331132 its reverse (23113313), we get a palindrome (54444445).

The spelling of 31331132 in words is "thirty-one million, three hundred thirty-one thousand, one hundred thirty-two".