31540900 has 18 divisors (see below), whose sum is σ = 68443970. Its totient is φ = 12616320.

The previous prime is 31540871. The next prime is 31540921. The reversal of 31540900 is 904513.

It can be written as a sum of positive squares in 3 ways, for example, as 1444 + 31539456 = 38^2 + 5616^2 .

It is a super-3 number, since 3×31540900³ (a number of 23 digits) contains 333 as substring.

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 5 ways as a sum of consecutive naturals, for example, 157605 + ... + 157804.

Almost surely, 2^31540900 is an apocalyptic number.

It is an amenable number.

31540900 is an abundant number, since it is smaller than the sum of its proper divisors (36903070).

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

31540900 is a wasteful number, since it uses less digits than its factorization.

31540900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315423 (or 315416 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 31540900 is about 5616.1285597821. The cubic root of 31540900 is about 315.9546081251.

The spelling of 31540900 in words is "thirty-one million, five hundred forty thousand, nine hundred".