231244331 has 2 divisors, whose sum is σ = 231244332. Its totient is φ = 231244330.

The previous prime is 231244327. The next prime is 231244337. The reversal of 231244331 is 133442132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231244331 - 2² = 231244327 is a prime.

It is a super-2 number, since 2×231244331² = 106947881239275122, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 231244297 and 231244306.

It is not a weakly prime, because it can be changed into another prime (231244337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115622165 + 115622166.

It is an arithmetic number, because the mean of its divisors is an integer number (115622166).

Almost surely, 2^231244331 is an apocalyptic number.

231244331 is a deficient number, since it is larger than the sum of its proper divisors (1).

231244331 is an equidigital number, since it uses as much as digits as its factorization.

231244331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 23.

The square root of 231244331 is about 15206.7199290314. The cubic root of 231244331 is about 613.7954973648.

Adding to 231244331 its reverse (133442132), we get a palindrome (364686463).

The spelling of 231244331 in words is "two hundred thirty-one million, two hundred forty-four thousand, three hundred thirty-one".