231939 has 6 divisors (see below), whose sum is σ = 335036. Its totient is φ = 154620.

The previous prime is 231923. The next prime is 231943. The reversal of 231939 is 939132.

It is not a de Polignac number, because 231939 - 2⁴ = 231923 is a prime.

It is a Duffinian number.

231939 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (231919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12877 + ... + 12894.

2²³¹⁹³⁹ is an apocalyptic number.

231939 is a deficient number, since it is larger than the sum of its proper divisors (103097).

231939 is a wasteful number, since it uses less digits than its factorization.

231939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25777 (or 25774 counting only the distinct ones).

The product of its digits is 1458, while the sum is 27.

The square root of 231939 is about 481.6004568104. The cubic root of 231939 is about 61.4409506587.

The spelling of 231939 in words is "two hundred thirty-one thousand, nine hundred thirty-nine".