30990531 has 64 divisors (see below), whose sum is σ = 52254720. Its totient is φ = 16074240.

The previous prime is 30990529. The next prime is 30990551. The reversal of 30990531 is 13509903.

It is not a de Polignac number, because 30990531 - 2¹ = 30990529 is a prime.

It is a super-2 number, since 2×30990531² = 1920826023323922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (30990551) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 584701 + ... + 584753.

It is an arithmetic number, because the mean of its divisors is an integer number (816480).

Almost surely, 2^30990531 is an apocalyptic number.

30990531 is a deficient number, since it is larger than the sum of its proper divisors (21264189).

30990531 is a wasteful number, since it uses less digits than its factorization.

30990531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156.

The product of its (nonzero) digits is 3645, while the sum is 30.

The square root of 30990531 is about 5566.9139565831. The cubic root of 30990531 is about 314.1060773224.

The spelling of 30990531 in words is "thirty million, nine hundred ninety thousand, five hundred thirty-one".