231331313 has 2 divisors, whose sum is σ = 231331314. Its totient is φ = 231331312.

The previous prime is 231331301. The next prime is 231331319. The reversal of 231331313 is 313133132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122921569 + 108409744 = 11087^2 + 10412^2 .

It is a cyclic number.

It is not a de Polignac number, because 231331313 - 2⁴ = 231331297 is a prime.

It is not a weakly prime, because it can be changed into another prime (231331319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115665656 + 115665657.

It is an arithmetic number, because the mean of its divisors is an integer number (115665657).

Almost surely, 2^231331313 is an apocalyptic number.

It is an amenable number.

231331313 is a deficient number, since it is larger than the sum of its proper divisors (1).

231331313 is an equidigital number, since it uses as much as digits as its factorization.

231331313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 486, while the sum is 20.

The square root of 231331313 is about 15209.5796457364. The cubic root of 231331313 is about 613.8724469518.

Adding to 231331313 its reverse (313133132), we get a palindrome (544464445).

The spelling of 231331313 in words is "two hundred thirty-one million, three hundred thirty-one thousand, three hundred thirteen".