31540132 has 48 divisors (see below), whose sum is σ = 62041840. Its totient is φ = 14017536.

The previous prime is 31540123. The next prime is 31540147. The reversal of 31540132 is 23104513.

It can be written as a sum of positive squares in 8 ways, for example, as 15492096 + 16048036 = 3936^2 + 4006^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 325108 + ... + 325204.

Almost surely, 2^31540132 is an apocalyptic number.

It is an amenable number.

31540132 is a deficient number, since it is larger than the sum of its proper divisors (30501708).

31540132 is a wasteful number, since it uses less digits than its factorization.

31540132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177 (or 149 counting only the distinct ones).

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

The square root of 31540132 is about 5616.0601848627. The cubic root of 31540132 is about 315.9520436759.

Adding to 31540132 its reverse (23104513), we get a palindrome (54644645).

The spelling of 31540132 in words is "thirty-one million, five hundred forty thousand, one hundred thirty-two".