231320413 has 2 divisors, whose sum is σ = 231320414. Its totient is φ = 231320412.

The previous prime is 231320399. The next prime is 231320423. The reversal of 231320413 is 314023132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210772324 + 20548089 = 14518^2 + 4533^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231320413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231320423) 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, 115660206 + 115660207.

It is an arithmetic number, because the mean of its divisors is an integer number (115660207).

Almost surely, 2^231320413 is an apocalyptic number.

It is an amenable number.

231320413 is a deficient number, since it is larger than the sum of its proper divisors (1).

231320413 is an equidigital number, since it uses as much as digits as its factorization.

231320413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 231320413 is about 15209.2213147156. The cubic root of 231320413 is about 613.8628052037.

Adding to 231320413 its reverse (314023132), we get a palindrome (545343545).

The spelling of 231320413 in words is "two hundred thirty-one million, three hundred twenty thousand, four hundred thirteen".