317512231 has 2 divisors, whose sum is σ = 317512232. Its totient is φ = 317512230.

The previous prime is 317512193. The next prime is 317512253. The reversal of 317512231 is 132215713.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 317512231 - 2¹⁷ = 317381159 is a prime.

It is a super-2 number, since 2×317512231² = 201628033669194722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 317512196 and 317512205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (317512031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158756115 + 158756116.

It is an arithmetic number, because the mean of its divisors is an integer number (158756116).

Almost surely, 2^317512231 is an apocalyptic number.

317512231 is a deficient number, since it is larger than the sum of its proper divisors (1).

317512231 is an equidigital number, since it uses as much as digits as its factorization.

317512231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1260, while the sum is 25.

The square root of 317512231 is about 17818.8728880364. The cubic root of 317512231 is about 682.2132549191.

Adding to 317512231 its reverse (132215713), we get a palindrome (449727944).

The spelling of 317512231 in words is "three hundred seventeen million, five hundred twelve thousand, two hundred thirty-one".