115613661 has 4 divisors (see below), whose sum is σ = 154151552. Its totient is φ = 77075772.

The previous prime is 115613647. The next prime is 115613671. The reversal of 115613661 is 166316511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 115613661 - 2¹⁵ = 115580893 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115613671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19268941 + ... + 19268946.

It is an arithmetic number, because the mean of its divisors is an integer number (38537888).

Almost surely, 2^115613661 is an apocalyptic number.

It is an amenable number.

115613661 is a deficient number, since it is larger than the sum of its proper divisors (38537891).

115613661 is an equidigital number, since it uses as much as digits as its factorization.

115613661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38537890.

The product of its digits is 3240, while the sum is 30.

The square root of 115613661 is about 10752.3793180858. The cubic root of 115613661 is about 487.1578643446.

The spelling of 115613661 in words is "one hundred fifteen million, six hundred thirteen thousand, six hundred sixty-one".