231331 has 2 divisors, whose sum is σ = 231332. Its totient is φ = 231330.

The previous prime is 231323. The next prime is 231347. The reversal of 231331 is 133132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231331 - 2³ = 231323 is a prime.

It is a super-2 number, since 2×231331² = 107028063122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (231031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115665 + 115666.

It is an arithmetic number, because the mean of its divisors is an integer number (115666).

2²³¹³³¹ is an apocalyptic number.

231331 is a deficient number, since it is larger than the sum of its proper divisors (1).

231331 is an equidigital number, since it uses as much as digits as its factorization.

231331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54, while the sum is 13.

The square root of 231331 is about 480.9688139578. The cubic root of 231331 is about 61.3872170087.

Adding to 231331 its reverse (133132), we get a palindrome (364463).

The spelling of 231331 in words is "two hundred thirty-one thousand, three hundred thirty-one".