113639 has 4 divisors (see below), whose sum is σ = 119640. Its totient is φ = 107640.

The previous prime is 113623. The next prime is 113647. The reversal of 113639 is 936311.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 113639 - 2⁴ = 113623 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2972 + ... + 3009.

It is an arithmetic number, because the mean of its divisors is an integer number (29910).

2¹¹³⁶³⁹ is an apocalyptic number.

113639 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

113639 is a deficient number, since it is larger than the sum of its proper divisors (6001).

113639 is an equidigital number, since it uses as much as digits as its factorization.

113639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6000.

The product of its digits is 486, while the sum is 23.

The square root of 113639 is about 337.1038415681. The cubic root of 113639 is about 48.4368398800.

The spelling of 113639 in words is "one hundred thirteen thousand, six hundred thirty-nine".