231331330331 has 2 divisors, whose sum is σ = 231331330332. Its totient is φ = 231331330330.

The previous prime is 231331330319. The next prime is 231331330333. The reversal of 231331330331 is 133033133132.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231331330331 is a prime.

It is a super-2 number, since 2×231331330331² (a number of 24 digits) contains 22 as substring.

Together with 231331330333, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231331330331.

It is not a weakly prime, because it can be changed into another prime (231331330333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115665665165 + 115665665166.

It is an arithmetic number, because the mean of its divisors is an integer number (115665665166).

Almost surely, 2^231331330331 is an apocalyptic number.

231331330331 is a deficient number, since it is larger than the sum of its proper divisors (1).

231331330331 is an equidigital number, since it uses as much as digits as its factorization.

231331330331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4374, while the sum is 26.

Adding to 231331330331 its reverse (133033133132), we get a palindrome (364364463463).

The spelling of 231331330331 in words is "two hundred thirty-one billion, three hundred thirty-one million, three hundred thirty thousand, three hundred thirty-one".