115635661 has 2 divisors, whose sum is σ = 115635662. Its totient is φ = 115635660.

The previous prime is 115635647. The next prime is 115635671. The reversal of 115635661 is 166536511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70879561 + 44756100 = 8419^2 + 6690^2 .

It is a cyclic number.

It is not a de Polignac number, because 115635661 - 2¹⁷ = 115504589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115635601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57817830 + 57817831.

It is an arithmetic number, because the mean of its divisors is an integer number (57817831).

Almost surely, 2^115635661 is an apocalyptic number.

It is an amenable number.

115635661 is a deficient number, since it is larger than the sum of its proper divisors (1).

115635661 is an equidigital number, since it uses as much as digits as its factorization.

115635661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16200, while the sum is 34.

The square root of 115635661 is about 10753.4022988076. The cubic root of 115635661 is about 487.1887626347.

The spelling of 115635661 in words is "one hundred fifteen million, six hundred thirty-five thousand, six hundred sixty-one".