115135561 has 2 divisors, whose sum is σ = 115135562. Its totient is φ = 115135560.

The previous prime is 115135549. The next prime is 115135567. The reversal of 115135561 is 165531511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104040000 + 11095561 = 10200^2 + 3331^2 .

It is a cyclic number.

It is not a de Polignac number, because 115135561 - 2⁵ = 115135529 is a prime.

It is not a weakly prime, because it can be changed into another prime (115135567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57567780 + 57567781.

It is an arithmetic number, because the mean of its divisors is an integer number (57567781).

Almost surely, 2^115135561 is an apocalyptic number.

It is an amenable number.

115135561 is a deficient number, since it is larger than the sum of its proper divisors (1).

115135561 is an equidigital number, since it uses as much as digits as its factorization.

115135561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2250, while the sum is 28.

The square root of 115135561 is about 10730.1239974196. The cubic root of 115135561 is about 486.4854179526.

The spelling of 115135561 in words is "one hundred fifteen million, one hundred thirty-five thousand, five hundred sixty-one".