30891172 has 18 divisors (see below), whose sum is σ = 58539138. Its totient is φ = 14257152.

The previous prime is 30891167. The next prime is 30891187. The reversal of 30891172 is 27119803.

It can be written as a sum of positive squares in 3 ways, for example, as 155236 + 30735936 = 394^2 + 5544^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22173 + ... + 23524.

Almost surely, 2^30891172 is an apocalyptic number.

It is an amenable number.

30891172 is a deficient number, since it is larger than the sum of its proper divisors (27647966).

30891172 is a wasteful number, since it uses less digits than its factorization.

30891172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45727 (or 45712 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 30891172 is about 5557.9827275730. The cubic root of 30891172 is about 313.7700318951.

The spelling of 30891172 in words is "thirty million, eight hundred ninety-one thousand, one hundred seventy-two".