231139 has 4 divisors (see below), whose sum is σ = 237424. Its totient is φ = 224856.

The previous prime is 231131. The next prime is 231169. The reversal of 231139 is 931132.

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 231139 - 2³ = 231131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231131) 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, 3087 + ... + 3160.

It is an arithmetic number, because the mean of its divisors is an integer number (59356).

2²³¹¹³⁹ is an apocalyptic number.

231139 is a deficient number, since it is larger than the sum of its proper divisors (6285).

231139 is an equidigital number, since it uses as much as digits as its factorization.

231139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6284.

The product of its digits is 162, while the sum is 19.

The square root of 231139 is about 480.7691753846. The cubic root of 231139 is about 61.3702289296.

The spelling of 231139 in words is "two hundred thirty-one thousand, one hundred thirty-nine".