231951 has 4 divisors (see below), whose sum is σ = 309272. Its totient is φ = 154632.

The previous prime is 231947. The next prime is 231961. The reversal of 231951 is 159132.

231951 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 not a de Polignac number, because 231951 - 2² = 231947 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 231951.

It is not an unprimeable number, because it can be changed into a prime (231901) 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, 38656 + ... + 38661.

It is an arithmetic number, because the mean of its divisors is an integer number (77318).

2²³¹⁹⁵¹ is an apocalyptic number.

231951 is a deficient number, since it is larger than the sum of its proper divisors (77321).

231951 is an equidigital number, since it uses as much as digits as its factorization.

231951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77320.

The product of its digits is 270, while the sum is 21.

The square root of 231951 is about 481.6129151092. The cubic root of 231951 is about 61.4420102458.

Adding to 231951 its product of digits (270), we get a triangular number (232221 = T₆₈₁).

The spelling of 231951 in words is "two hundred thirty-one thousand, nine hundred fifty-one".