30481931 has 2 divisors, whose sum is σ = 30481932. Its totient is φ = 30481930.

The previous prime is 30481907. The next prime is 30481949. The reversal of 30481931 is 13918403.

It is a strong prime.

It is an emirp because it is prime and its reverse (13918403) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30481931 is a prime.

It is a super-2 number, since 2×30481931² = 1858296234977522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 30481894 and 30481903.

It is not a weakly prime, because it can be changed into another prime (30481331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15240965 + 15240966.

It is an arithmetic number, because the mean of its divisors is an integer number (15240966).

Almost surely, 2^30481931 is an apocalyptic number.

30481931 is a deficient number, since it is larger than the sum of its proper divisors (1).

30481931 is an equidigital number, since it uses as much as digits as its factorization.

30481931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 30481931 is about 5521.0443758405. The cubic root of 30481931 is about 312.3782770734.

The spelling of 30481931 in words is "thirty million, four hundred eighty-one thousand, nine hundred thirty-one".