115511551 has 8 divisors (see below), whose sum is σ = 118318640. Its totient is φ = 112736448.

The previous prime is 115511537. The next prime is 115511563. The reversal of 115511551 is 155115511.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-115511551 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 (115511531) 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, 606 + ... + 15211.

It is an arithmetic number, because the mean of its divisors is an integer number (14789830).

Almost surely, 2^115511551 is an apocalyptic number.

115511551 is a deficient number, since it is larger than the sum of its proper divisors (2807089).

115511551 is a wasteful number, since it uses less digits than its factorization.

115511551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15993.

The product of its digits is 625, while the sum is 25.

The square root of 115511551 is about 10747.6300178225. The cubic root of 115511551 is about 487.0144028055.

The spelling of 115511551 in words is "one hundred fifteen million, five hundred eleven thousand, five hundred fifty-one".