231609317 has 2 divisors, whose sum is σ = 231609318. Its totient is φ = 231609316.

The previous prime is 231609293. The next prime is 231609319. The reversal of 231609317 is 713906132.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140043556 + 91565761 = 11834^2 + 9569^2 .

It is a cyclic number.

It is not a de Polignac number, because 231609317 - 2²⁰ = 230560741 is a prime.

Together with 231609319, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_12726248 and since 231609317 and 12726248 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231609319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115804658 + 115804659.

It is an arithmetic number, because the mean of its divisors is an integer number (115804659).

Almost surely, 2^231609317 is an apocalyptic number.

It is an amenable number.

231609317 is a deficient number, since it is larger than the sum of its proper divisors (1).

231609317 is an equidigital number, since it uses as much as digits as its factorization.

231609317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 32.

The square root of 231609317 is about 15218.7160102290. The cubic root of 231609317 is about 614.1182569917.

The spelling of 231609317 in words is "two hundred thirty-one million, six hundred nine thousand, three hundred seventeen".