113159581 has 4 divisors (see below), whose sum is σ = 115077600. Its totient is φ = 111241564.

The previous prime is 113159561. The next prime is 113159591. The reversal of 113159581 is 185951311.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 113159581 - 2⁹ = 113159069 is a prime.

It is a super-2 number, since 2×113159581² = 25610181544191122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113159561) 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, 958921 + ... + 959038.

It is an arithmetic number, because the mean of its divisors is an integer number (28769400).

Almost surely, 2^113159581 is an apocalyptic number.

It is an amenable number.

113159581 is a deficient number, since it is larger than the sum of its proper divisors (1918019).

113159581 is an equidigital number, since it uses as much as digits as its factorization.

113159581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1918018.

The product of its digits is 5400, while the sum is 34.

The square root of 113159581 is about 10637.6492233952. The cubic root of 113159581 is about 483.6862892635.

The spelling of 113159581 in words is "one hundred thirteen million, one hundred fifty-nine thousand, five hundred eighty-one".