30508981561 has 2 divisors, whose sum is σ = 30508981562. Its totient is φ = 30508981560.

The previous prime is 30508981487. The next prime is 30508981567. The reversal of 30508981561 is 16518980503.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27569281600 + 2939699961 = 166040^2 + 54219^2 .

It is a cyclic number.

It is not a de Polignac number, because 30508981561 - 2²³ = 30500592953 is a prime.

It is not a weakly prime, because it can be changed into another prime (30508981567) 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, 15254490780 + 15254490781.

It is an arithmetic number, because the mean of its divisors is an integer number (15254490781).

Almost surely, 2^30508981561 is an apocalyptic number.

It is an amenable number.

30508981561 is a deficient number, since it is larger than the sum of its proper divisors (1).

30508981561 is an equidigital number, since it uses as much as digits as its factorization.

30508981561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 259200, while the sum is 46.

The spelling of 30508981561 in words is "thirty billion, five hundred eight million, nine hundred eighty-one thousand, five hundred sixty-one".