30918248561 has 2 divisors, whose sum is σ = 30918248562. Its totient is φ = 30918248560.

The previous prime is 30918248531. The next prime is 30918248609. The reversal of 30918248561 is 16584281903.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17356481536 + 13561767025 = 131744^2 + 116455^2 .

It is a cyclic number.

It is not a de Polignac number, because 30918248561 - 2⁶ = 30918248497 is a prime.

It is not a weakly prime, because it can be changed into another prime (30918248531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15459124280 + 15459124281.

It is an arithmetic number, because the mean of its divisors is an integer number (15459124281).

Almost surely, 2^30918248561 is an apocalyptic number.

It is an amenable number.

30918248561 is a deficient number, since it is larger than the sum of its proper divisors (1).

30918248561 is an equidigital number, since it uses as much as digits as its factorization.

30918248561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 414720, while the sum is 47.

The spelling of 30918248561 in words is "thirty billion, nine hundred eighteen million, two hundred forty-eight thousand, five hundred sixty-one".