309231 has 16 divisors (see below), whose sum is σ = 493920. Its totient is φ = 190080.

The previous prime is 309223. The next prime is 309241. The reversal of 309231 is 132903.

It is not a de Polignac number, because 309231 - 2³ = 309223 is a prime.

It is a super-2 number, since 2×309231² = 191247622722, which contains 22 as substring.

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 309231.

It is not an unprimeable number, because it can be changed into a prime (309241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90 + ... + 791.

It is an arithmetic number, because the mean of its divisors is an integer number (30870).

2³⁰⁹²³¹ is an apocalyptic number.

309231 is a deficient number, since it is larger than the sum of its proper divisors (184689).

309231 is a wasteful number, since it uses less digits than its factorization.

309231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 903 (or 897 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

The square root of 309231 is about 556.0854250922. The cubic root of 309231 is about 67.6229856594.

It can be divided in two parts, 30 and 9231, that added together give a cube (9261 = 21³).

The spelling of 309231 in words is "three hundred nine thousand, two hundred thirty-one".