231340313 has 4 divisors (see below), whose sum is σ = 233502480. Its totient is φ = 229178148.

The previous prime is 231340309. The next prime is 231340393. The reversal of 231340313 is 313043132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 231340313 - 2² = 231340309 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231340303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1080923 + ... + 1081136.

It is an arithmetic number, because the mean of its divisors is an integer number (58375620).

Almost surely, 2^231340313 is an apocalyptic number.

It is an amenable number.

231340313 is a deficient number, since it is larger than the sum of its proper divisors (2162167).

231340313 is a wasteful number, since it uses less digits than its factorization.

231340313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2162166.

The product of its (nonzero) digits is 648, while the sum is 20.

The square root of 231340313 is about 15209.8755090237. The cubic root of 231340313 is about 613.8804078000.

Adding to 231340313 its reverse (313043132), we get a palindrome (544383445).

The spelling of 231340313 in words is "two hundred thirty-one million, three hundred forty thousand, three hundred thirteen".