115601551 has 4 divisors (see below), whose sum is σ = 124493992. Its totient is φ = 106709112.

The previous prime is 115601503. The next prime is 115601557. The reversal of 115601551 is 155106511.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 115601551 - 2¹⁷ = 115470479 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 (115601557) 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, 4446201 + ... + 4446226.

It is an arithmetic number, because the mean of its divisors is an integer number (31123498).

Almost surely, 2^115601551 is an apocalyptic number.

115601551 is a deficient number, since it is larger than the sum of its proper divisors (8892441).

115601551 is an equidigital number, since it uses as much as digits as its factorization.

115601551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8892440.

The product of its (nonzero) digits is 750, while the sum is 25.

The square root of 115601551 is about 10751.8161721637. The cubic root of 115601551 is about 487.1408545678.

The spelling of 115601551 in words is "one hundred fifteen million, six hundred one thousand, five hundred fifty-one".