30985931 has 2 divisors, whose sum is σ = 30985932. Its totient is φ = 30985930.

The previous prime is 30985921. The next prime is 30985943. The reversal of 30985931 is 13958903.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 30985931 - 2¹⁸ = 30723787 is a prime.

It is a super-2 number, since 2×30985931² = 1920255839873522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (30985921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15492965 + 15492966.

It is an arithmetic number, because the mean of its divisors is an integer number (15492966).

Almost surely, 2^30985931 is an apocalyptic number.

30985931 is a deficient number, since it is larger than the sum of its proper divisors (1).

30985931 is an equidigital number, since it uses as much as digits as its factorization.

30985931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 30985931 is about 5566.5007859516. The cubic root of 30985931 is about 314.0905353767.

The spelling of 30985931 in words is "thirty million, nine hundred eighty-five thousand, nine hundred thirty-one".