231979 has 4 divisors (see below), whose sum is σ = 253080. Its totient is φ = 210880.

The previous prime is 231967. The next prime is 232003. The reversal of 231979 is 979132.

231979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 231979 - 2⁵ = 231947 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 231979.

It is not an unprimeable number, because it can be changed into a prime (231919) 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, 10534 + ... + 10555.

It is an arithmetic number, because the mean of its divisors is an integer number (63270).

2²³¹⁹⁷⁹ is an apocalyptic number.

231979 is a deficient number, since it is larger than the sum of its proper divisors (21101).

231979 is a wasteful number, since it uses less digits than its factorization.

231979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21100.

The product of its digits is 3402, while the sum is 31.

The square root of 231979 is about 481.6419832199. The cubic root of 231979 is about 61.4444824735. Note that the first 4 decimals are identical.

It can be divided in two parts, 23 and 1979, that added together give a palindrome (2002).

The spelling of 231979 in words is "two hundred thirty-one thousand, nine hundred seventy-nine".