231220042313 has 4 divisors (see below), whose sum is σ = 249006199428. Its totient is φ = 213433885200.

The previous prime is 231220042279. The next prime is 231220042379. The reversal of 231220042313 is 313240022132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 71646158224 + 159573884089 = 267668^2 + 399467^2 .

It is a cyclic number.

It is not a de Polignac number, because 231220042313 - 2⁸ = 231220042057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (231220041313) 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, 8893078538 + ... + 8893078563.

It is an arithmetic number, because the mean of its divisors is an integer number (62251549857).

Almost surely, 2^231220042313 is an apocalyptic number.

It is an amenable number.

231220042313 is a deficient number, since it is larger than the sum of its proper divisors (17786157115).

231220042313 is a wasteful number, since it uses less digits than its factorization.

231220042313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17786157114.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 231220042313 its reverse (313240022132), we get a palindrome (544460064445).

The spelling of 231220042313 in words is "two hundred thirty-one billion, two hundred twenty million, forty-two thousand, three hundred thirteen".