231399 has 12 divisors (see below), whose sum is σ = 382096. Its totient is φ = 132192.

The previous prime is 231379. The next prime is 231409. The reversal of 231399 is 993132.

231399 = 122² + 123² + ... + 135².

231399 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 231399 - 2⁵ = 231367 is a prime.

It is a Duffinian number.

231399 is strictly pandigital in base 7.

It is a zygodrome in base 2.

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 231399.

It is not an unprimeable number, because it can be changed into a prime (231349) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1774 + ... + 1899.

2²³¹³⁹⁹ is an apocalyptic number.

231399 is a deficient number, since it is larger than the sum of its proper divisors (150697).

231399 is a wasteful number, since it uses less digits than its factorization.

231399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3686 (or 3683 counting only the distinct ones).

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

The square root of 231399 is about 481.0394994177. The cubic root of 231399 is about 61.3932313660.

It can be divided in two parts, 231 and 399, that added together give a triangular number (630 = T₃₅).

The spelling of 231399 in words is "two hundred thirty-one thousand, three hundred ninety-nine".