30520913 has 2 divisors, whose sum is σ = 30520914. Its totient is φ = 30520912.

The previous prime is 30520883. The next prime is 30520921. The reversal of 30520913 is 31902503.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25928464 + 4592449 = 5092^2 + 2143^2 .

It is a cyclic number.

It is not a de Polignac number, because 30520913 - 2¹⁸ = 30258769 is a prime.

It is a super-2 number, since 2×30520913² = 1863052260707138, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (30520993) 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, 15260456 + 15260457.

It is an arithmetic number, because the mean of its divisors is an integer number (15260457).

Almost surely, 2^30520913 is an apocalyptic number.

It is an amenable number.

30520913 is a deficient number, since it is larger than the sum of its proper divisors (1).

30520913 is an equidigital number, since it uses as much as digits as its factorization.

30520913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 810, while the sum is 23.

The square root of 30520913 is about 5524.5735582034. The cubic root of 30520913 is about 312.5113826254.

The spelling of 30520913 in words is "thirty million, five hundred twenty thousand, nine hundred thirteen".