30513625721 has 2 divisors, whose sum is σ = 30513625722. Its totient is φ = 30513625720.

The previous prime is 30513625699. The next prime is 30513625759. The reversal of 30513625721 is 12752631503.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21862579600 + 8651046121 = 147860^2 + 93011^2 .

It is a cyclic number.

It is not a de Polignac number, because 30513625721 - 2¹⁸ = 30513363577 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (30513625321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15256812860 + 15256812861.

It is an arithmetic number, because the mean of its divisors is an integer number (15256812861).

Almost surely, 2^30513625721 is an apocalyptic number.

It is an amenable number.

30513625721 is a deficient number, since it is larger than the sum of its proper divisors (1).

30513625721 is an equidigital number, since it uses as much as digits as its factorization.

30513625721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37800, while the sum is 35.

The spelling of 30513625721 in words is "thirty billion, five hundred thirteen million, six hundred twenty-five thousand, seven hundred twenty-one".