56139 has 4 divisors (see below), whose sum is σ = 74856. Its totient is φ = 37424.

The previous prime is 56131. The next prime is 56149. The reversal of 56139 is 93165.

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 56139 - 2³ = 56131 is a prime.

It is a D-number.

56139 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (56131) 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, 9354 + ... + 9359.

It is an arithmetic number, because the mean of its divisors is an integer number (18714).

2⁵⁶¹³⁹ is an apocalyptic number.

56139 is a deficient number, since it is larger than the sum of its proper divisors (18717).

56139 is a wasteful number, since it uses less digits than its factorization.

56139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18716.

The product of its digits is 810, while the sum is 24.

The square root of 56139 is about 236.9367004075. The cubic root of 56139 is about 38.2902519577.

The spelling of 56139 in words is "fifty-six thousand, one hundred thirty-nine".