231220303313 has 4 divisors (see below), whose sum is σ = 236859822948. Its totient is φ = 225580783680.

The previous prime is 231220303289. The next prime is 231220303333. The reversal of 231220303313 is 313303022132.

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 82680976849 + 148539326464 = 287543^2 + 385408^2 .

It is a cyclic number.

It is not a de Polignac number, because 231220303313 - 2¹⁴ = 231220286929 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 (231220303333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2819759756 + ... + 2819759837.

It is an arithmetic number, because the mean of its divisors is an integer number (59214955737).

Almost surely, 2^231220303313 is an apocalyptic number.

It is an amenable number.

231220303313 is a deficient number, since it is larger than the sum of its proper divisors (5639519635).

231220303313 is an equidigital number, since it uses as much as digits as its factorization.

231220303313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5639519634.

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 231220303313 its reverse (313303022132), we get a palindrome (544523325445).

The spelling of 231220303313 in words is "two hundred thirty-one billion, two hundred twenty million, three hundred three thousand, three hundred thirteen".