115801581 has 16 divisors (see below), whose sum is σ = 177389568. Its totient is φ = 65823600.

The previous prime is 115801577. The next prime is 115801643. The reversal of 115801581 is 185108511.

It is not a de Polignac number, because 115801581 - 2² = 115801577 is a prime.

It is a super-2 number, since 2×115801581² = 26820012324199122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115801531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10425 + ... + 18446.

It is an arithmetic number, because the mean of its divisors is an integer number (11086848).

Almost surely, 2^115801581 is an apocalyptic number.

It is an amenable number.

115801581 is a deficient number, since it is larger than the sum of its proper divisors (61587987).

115801581 is a wasteful number, since it uses less digits than its factorization.

115801581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29072.

The product of its (nonzero) digits is 1600, while the sum is 30.

The square root of 115801581 is about 10761.1143010378. The cubic root of 115801581 is about 487.4216657830.

The spelling of 115801581 in words is "one hundred fifteen million, eight hundred one thousand, five hundred eighty-one".