30900931 has 2 divisors, whose sum is σ = 30900932. Its totient is φ = 30900930.

The previous prime is 30900913. The next prime is 30900941. The reversal of 30900931 is 13900903.

Together with previous prime (30900913) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 30900931 - 2⁷ = 30900803 is a prime.

It is a super-2 number, since 2×30900931² = 1909735073333522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 30900896 and 30900905.

It is not a weakly prime, because it can be changed into another prime (30900911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15450465 + 15450466.

It is an arithmetic number, because the mean of its divisors is an integer number (15450466).

Almost surely, 2^30900931 is an apocalyptic number.

30900931 is a deficient number, since it is larger than the sum of its proper divisors (1).

30900931 is an equidigital number, since it uses as much as digits as its factorization.

30900931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 729, while the sum is 25.

The square root of 30900931 is about 5558.8605846882. The cubic root of 30900931 is about 313.8030700216.

The spelling of 30900931 in words is "thirty million, nine hundred thousand, nine hundred thirty-one".