113561 has 4 divisors (see below), whose sum is σ = 129792. Its totient is φ = 97332.

The previous prime is 113557. The next prime is 113567. The reversal of 113561 is 165311.

113561 is an esthetic number in base 4, because in such base its adjacent digits differ by 1.

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 113561 - 2² = 113557 is a prime.

It is a super-2 number, since 2×113561² = 25792201442, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (113567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8105 + ... + 8118.

It is an arithmetic number, because the mean of its divisors is an integer number (32448).

2¹¹³⁵⁶¹ is an apocalyptic number.

It is an amenable number.

113561 is a deficient number, since it is larger than the sum of its proper divisors (16231).

113561 is an equidigital number, since it uses as much as digits as its factorization.

113561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16230.

The product of its digits is 90, while the sum is 17.

The square root of 113561 is about 336.9881303548. The cubic root of 113561 is about 48.4257552517.

Adding to 113561 its reverse (165311), we get a palindrome (278872).

The spelling of 113561 in words is "one hundred thirteen thousand, five hundred sixty-one".