231321613 has 8 divisors (see below), whose sum is σ = 235061856. Its totient is φ = 227610000.

The previous prime is 231321593. The next prime is 231321641. The reversal of 231321613 is 316123132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231321613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231321113) 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 7 ways as a sum of consecutive naturals, for example, 9438 + ... + 23488.

It is an arithmetic number, because the mean of its divisors is an integer number (29382732).

Almost surely, 2^231321613 is an apocalyptic number.

It is an amenable number.

231321613 is a deficient number, since it is larger than the sum of its proper divisors (3740243).

231321613 is a wasteful number, since it uses less digits than its factorization.

231321613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14315.

The product of its digits is 648, while the sum is 22.

The square root of 231321613 is about 15209.2607644159. The cubic root of 231321613 is about 613.8638666954.

Adding to 231321613 its reverse (316123132), we get a palindrome (547444745).

The spelling of 231321613 in words is "two hundred thirty-one million, three hundred twenty-one thousand, six hundred thirteen".