231322637813 has 4 divisors (see below), whose sum is σ = 244929851820. Its totient is φ = 217715423808.

The previous prime is 231322637789. The next prime is 231322637873. The reversal of 231322637813 is 318736223132.

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 147719541649 + 83603096164 = 384343^2 + 289142^2 .

It is a cyclic number.

It is not a de Polignac number, because 231322637813 - 2¹⁰ = 231322636789 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 (231322637873) 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, 6803606978 + ... + 6803607011.

It is an arithmetic number, because the mean of its divisors is an integer number (61232462955).

Almost surely, 2^231322637813 is an apocalyptic number.

It is an amenable number.

231322637813 is a deficient number, since it is larger than the sum of its proper divisors (13607214007).

231322637813 is a wasteful number, since it uses less digits than its factorization.

231322637813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13607214006.

The product of its digits is 217728, while the sum is 41.

The spelling of 231322637813 in words is "two hundred thirty-one billion, three hundred twenty-two million, six hundred thirty-seven thousand, eight hundred thirteen".