30919931 has 12 divisors (see below), whose sum is σ = 36101520. Its totient is φ = 26404560.

The previous prime is 30919891. The next prime is 30919939. The reversal of 30919931 is 13991903.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-30919931 is a prime.

It is a super-2 number, since 2×30919931² = 1912084266089522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 30919891 and 30919900.

It is not an unprimeable number, because it can be changed into a prime (30919939) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14225 + ... + 16253.

It is an arithmetic number, because the mean of its divisors is an integer number (3008460).

Almost surely, 2^30919931 is an apocalyptic number.

30919931 is a deficient number, since it is larger than the sum of its proper divisors (5181589).

30919931 is a wasteful number, since it uses less digits than its factorization.

30919931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2354 (or 2347 counting only the distinct ones).

The product of its (nonzero) digits is 6561, while the sum is 35.

The square root of 30919931 is about 5560.5693053859. The cubic root of 30919931 is about 313.8673726877.

The spelling of 30919931 in words is "thirty million, nine hundred nineteen thousand, nine hundred thirty-one".