115617881 has 4 divisors (see below), whose sum is σ = 115644672. Its totient is φ = 115591092.

The previous prime is 115617877. The next prime is 115617899. The reversal of 115617881 is 188716511.

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, and also an emirpimes, since its reverse is a distinct semiprime: 188716511 = 6917 ⋅27283.

It is a cyclic number.

It is not a de Polignac number, because 115617881 - 2² = 115617877 is a prime.

It is a super-2 number, since 2×115617881² = 26734988813860322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (115617851) 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, 5285 + ... + 16098.

It is an arithmetic number, because the mean of its divisors is an integer number (28911168).

Almost surely, 2^115617881 is an apocalyptic number.

It is an amenable number.

115617881 is a deficient number, since it is larger than the sum of its proper divisors (26791).

115617881 is an equidigital number, since it uses as much as digits as its factorization.

115617881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26790.

The product of its digits is 13440, while the sum is 38.

The square root of 115617881 is about 10752.5755519317. The cubic root of 115617881 is about 487.1637915023.

The spelling of 115617881 in words is "one hundred fifteen million, six hundred seventeen thousand, eight hundred eighty-one".