231345317 has 6 divisors (see below), whose sum is σ = 269116038. Its totient is φ = 198295944.

The previous prime is 231345287. The next prime is 231345337. The reversal of 231345317 is 713543132.

It can be written as a sum of positive squares in only one way, i.e., 229037956 + 2307361 = 15134^2 + 1519^2 .

It is not a de Polignac number, because 231345317 - 2²⁰ = 230296741 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 231345317.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231345337) 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 in 5 ways as a sum of consecutive naturals, for example, 2360618 + ... + 2360715.

It is an arithmetic number, because the mean of its divisors is an integer number (44852673).

Almost surely, 2^231345317 is an apocalyptic number.

It is an amenable number.

231345317 is a deficient number, since it is larger than the sum of its proper divisors (37770721).

231345317 is an equidigital number, since it uses as much as digits as its factorization.

231345317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4721347 (or 4721340 counting only the distinct ones).

The product of its digits is 7560, while the sum is 29.

The square root of 231345317 is about 15210.0400065220. The cubic root of 231345317 is about 613.8848339422.

Adding to 231345317 its reverse (713543132), we get a palindrome (944888449).

The spelling of 231345317 in words is "two hundred thirty-one million, three hundred forty-five thousand, three hundred seventeen".