115544551 has 4 divisors (see below), whose sum is σ = 116062912. Its totient is φ = 115026192.

The previous prime is 115544503. The next prime is 115544591. The reversal of 115544551 is 155445511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155445511 = 13 ⋅11957347.

It is a cyclic number.

It is not a de Polignac number, because 115544551 - 2¹⁵ = 115511783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115544591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 258846 + ... + 259291.

It is an arithmetic number, because the mean of its divisors is an integer number (29015728).

Almost surely, 2^115544551 is an apocalyptic number.

115544551 is a deficient number, since it is larger than the sum of its proper divisors (518361).

115544551 is an equidigital number, since it uses as much as digits as its factorization.

115544551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518360.

The product of its digits is 10000, while the sum is 31.

The square root of 115544551 is about 10749.1651303718. The cubic root of 115544551 is about 487.0607760756.

The spelling of 115544551 in words is "one hundred fifteen million, five hundred forty-four thousand, five hundred fifty-one".