115604561 has 2 divisors, whose sum is σ = 115604562. Its totient is φ = 115604560.

The previous prime is 115604557. The next prime is 115604591. The reversal of 115604561 is 165406511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92756161 + 22848400 = 9631^2 + 4780^2 .

It is a cyclic number.

It is not a de Polignac number, because 115604561 - 2² = 115604557 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p_6605219 and since 115604561 and 6605219 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (115604521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57802280 + 57802281.

It is an arithmetic number, because the mean of its divisors is an integer number (57802281).

Almost surely, 2^115604561 is an apocalyptic number.

It is an amenable number.

115604561 is a deficient number, since it is larger than the sum of its proper divisors (1).

115604561 is an equidigital number, since it uses as much as digits as its factorization.

115604561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 115604561 is about 10751.9561476040. The cubic root of 115604561 is about 487.1450825423.

The spelling of 115604561 in words is "one hundred fifteen million, six hundred four thousand, five hundred sixty-one".