115551561 has 8 divisors (see below), whose sum is σ = 154283584. Its totient is φ = 76926960.

The previous prime is 115551551. The next prime is 115551587. The reversal of 115551561 is 165155511.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 115551561 - 2⁷ = 115551433 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (115551511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24310 + ... + 28671.

It is an arithmetic number, because the mean of its divisors is an integer number (19285448).

Almost surely, 2^115551561 is an apocalyptic number.

It is an amenable number.

115551561 is a deficient number, since it is larger than the sum of its proper divisors (38732023).

115551561 is an equidigital number, since it uses as much as digits as its factorization.

115551561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53711.

The product of its digits is 3750, while the sum is 30.

The square root of 115551561 is about 10749.4911972614. The cubic root of 115551561 is about 487.0706257453.

The spelling of 115551561 in words is "one hundred fifteen million, five hundred fifty-one thousand, five hundred sixty-one".