30690931 has 2 divisors, whose sum is σ = 30690932. Its totient is φ = 30690930.

The previous prime is 30690923. The next prime is 30690941. The reversal of 30690931 is 13909603.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 30690931 - 2³ = 30690923 is a prime.

It is a super-2 number, since 2×30690931² = 1883866491293522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 30690893 and 30690902.

It is not a weakly prime, because it can be changed into another prime (30690941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15345465 + 15345466.

It is an arithmetic number, because the mean of its divisors is an integer number (15345466).

Almost surely, 2^30690931 is an apocalyptic number.

30690931 is a deficient number, since it is larger than the sum of its proper divisors (1).

30690931 is an equidigital number, since it uses as much as digits as its factorization.

30690931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4374, while the sum is 31.

The square root of 30690931 is about 5539.9396206096. The cubic root of 30690931 is about 313.0905942784.

The spelling of 30690931 in words is "thirty million, six hundred ninety thousand, nine hundred thirty-one".