31132540 has 24 divisors (see below), whose sum is σ = 67146912. Its totient is φ = 12116160.

The previous prime is 31132537. The next prime is 31132567. The reversal of 31132540 is 4523113.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20296 + ... + 21775.

It is an arithmetic number, because the mean of its divisors is an integer number (2797788).

Almost surely, 2^31132540 is an apocalyptic number.

It is an amenable number.

31132540 is an abundant number, since it is smaller than the sum of its proper divisors (36014372).

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

31132540 is a wasteful number, since it uses less digits than its factorization.

31132540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42117 (or 42115 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 31132540 is about 5579.6541111434. The cubic root of 31132540 is about 314.5851261197.

Adding to 31132540 its reverse (4523113), we get a palindrome (35655653).

The spelling of 31132540 in words is "thirty-one million, one hundred thirty-two thousand, five hundred forty".