18231313313 has 4 divisors (see below), whose sum is σ = 18436159620. Its totient is φ = 18026467008.

The previous prime is 18231313283. The next prime is 18231313337. The reversal of 18231313313 is 31331313281.

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 9059803489 + 9171509824 = 95183^2 + 95768^2 .

It is a cyclic number.

It is not a de Polignac number, because 18231313313 - 2³⁰ = 17157571489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18231313343) 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, 102423020 + ... + 102423197.

It is an arithmetic number, because the mean of its divisors is an integer number (4609039905).

Almost surely, 2^18231313313 is an apocalyptic number.

It is an amenable number.

18231313313 is a deficient number, since it is larger than the sum of its proper divisors (204846307).

18231313313 is an equidigital number, since it uses as much as digits as its factorization.

18231313313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204846306.

The product of its digits is 3888, while the sum is 29.

Adding to 18231313313 its reverse (31331313281), we get a palindrome (49562626594).

The spelling of 18231313313 in words is "eighteen billion, two hundred thirty-one million, three hundred thirteen thousand, three hundred thirteen".