231313213 has 2 divisors, whose sum is σ = 231313214. Its totient is φ = 231313212.

The previous prime is 231313207. The next prime is 231313223. The reversal of 231313213 is 312313132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193822084 + 37491129 = 13922^2 + 6123^2 .

It is a cyclic number.

It is not a de Polignac number, because 231313213 - 2⁹ = 231312701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231313223) 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, 115656606 + 115656607.

It is an arithmetic number, because the mean of its divisors is an integer number (115656607).

Almost surely, 2^231313213 is an apocalyptic number.

It is an amenable number.

231313213 is a deficient number, since it is larger than the sum of its proper divisors (1).

231313213 is an equidigital number, since it uses as much as digits as its factorization.

231313213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324, while the sum is 19.

The square root of 231313213 is about 15208.9846143653. The cubic root of 231313213 is about 613.8564361764.

Adding to 231313213 its reverse (312313132), we get a palindrome (543626345).

The spelling of 231313213 in words is "two hundred thirty-one million, three hundred thirteen thousand, two hundred thirteen".