231302213 has 2 divisors, whose sum is σ = 231302214. Its totient is φ = 231302212.

The previous prime is 231302171. The next prime is 231302293. The reversal of 231302213 is 312203132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138815524 + 92486689 = 11782^2 + 9617^2 .

It is a cyclic number.

It is not a de Polignac number, because 231302213 - 2⁸ = 231301957 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 231302191 and 231302200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231302293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115651106 + 115651107.

It is an arithmetic number, because the mean of its divisors is an integer number (115651107).

Almost surely, 2^231302213 is an apocalyptic number.

It is an amenable number.

231302213 is a deficient number, since it is larger than the sum of its proper divisors (1).

231302213 is an equidigital number, since it uses as much as digits as its factorization.

231302213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 231302213 is about 15208.6229817167. The cubic root of 231302213 is about 613.8467054629.

Adding to 231302213 its reverse (312203132), we get a palindrome (543505345).

The spelling of 231302213 in words is "two hundred thirty-one million, three hundred two thousand, two hundred thirteen".