113999561 has 12 divisors (see below), whose sum is σ = 123903948. Its totient is φ = 104265024.

The previous prime is 113999549. The next prime is 113999573. The reversal of 113999561 is 165999311.

It is an interprime number because it is at equal distance from previous prime (113999549) and next prime (113999573).

It can be written as a sum of positive squares in 6 ways, for example, as 32205625 + 81793936 = 5675^2 + 9044^2 .

It is not a de Polignac number, because 113999561 - 2⁶ = 113999497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (113999531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 388931 + ... + 389223.

It is an arithmetic number, because the mean of its divisors is an integer number (10325329).

Almost surely, 2^113999561 is an apocalyptic number.

It is an amenable number.

113999561 is a deficient number, since it is larger than the sum of its proper divisors (9904387).

113999561 is an equidigital number, since it uses as much as digits as its factorization.

113999561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652 (or 479 counting only the distinct ones).

The product of its digits is 65610, while the sum is 44.

The square root of 113999561 is about 10677.0576939530. The cubic root of 113999561 is about 484.8801361778.

The spelling of 113999561 in words is "one hundred thirteen million, nine hundred ninety-nine thousand, five hundred sixty-one".