113642561 has 8 divisors (see below), whose sum is σ = 117926400. Its totient is φ = 109383120.

The previous prime is 113642549. The next prime is 113642579. The reversal of 113642561 is 165246311.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-113642561 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (113642461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3680 + ... + 15518.

It is an arithmetic number, because the mean of its divisors is an integer number (14740800).

Almost surely, 2^113642561 is an apocalyptic number.

It is an amenable number.

113642561 is a deficient number, since it is larger than the sum of its proper divisors (4283839).

113642561 is a wasteful number, since it uses less digits than its factorization.

113642561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12199.

The product of its digits is 4320, while the sum is 29.

The square root of 113642561 is about 10660.3264959381. The cubic root of 113642561 is about 484.3734581484.

Adding to 113642561 its reverse (165246311), we get a palindrome (278888872).

The spelling of 113642561 in words is "one hundred thirteen million, six hundred forty-two thousand, five hundred sixty-one".