30521865961 has 2 divisors, whose sum is σ = 30521865962. Its totient is φ = 30521865960.

The previous prime is 30521865949. The next prime is 30521866003. The reversal of 30521865961 is 16956812503.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16992686736 + 13529179225 = 130356^2 + 116315^2 .

It is a cyclic number.

It is not a de Polignac number, because 30521865961 - 2⁵ = 30521865929 is a prime.

It is not a weakly prime, because it can be changed into another prime (30521865911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15260932980 + 15260932981.

It is an arithmetic number, because the mean of its divisors is an integer number (15260932981).

Almost surely, 2^30521865961 is an apocalyptic number.

It is an amenable number.

30521865961 is a deficient number, since it is larger than the sum of its proper divisors (1).

30521865961 is an equidigital number, since it uses as much as digits as its factorization.

30521865961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 388800, while the sum is 46.

The spelling of 30521865961 in words is "thirty billion, five hundred twenty-one million, eight hundred sixty-five thousand, nine hundred sixty-one".