18319351801 has 3 divisors (see below), whose sum is σ = 18319487151. Its totient is φ = 18319216452.

The previous prime is 18319351789. The next prime is 18319351837. The reversal of 18319351801 is 10815391381.

The square root of 18319351801 is 135349.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 4475476201 + 13843875600 = 66899^2 + 117660^2 .

It is not a de Polignac number, because 18319351801 - 2¹⁵ = 18319319033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18319351891) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 67675 + ... + 203023.

It is an arithmetic number, because the mean of its divisors is an integer number (6106495717).

Almost surely, 2^18319351801 is an apocalyptic number.

18319351801 is the 135349-th square number.

18319351801 is the 67675-th centered octagonal number.

It is an amenable number.

18319351801 is a deficient number, since it is larger than the sum of its proper divisors (135350).

18319351801 is an frugal number, since it uses more digits than its factorization.

18319351801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270698 (or 135349 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 40.

The spelling of 18319351801 in words is "eighteen billion, three hundred nineteen million, three hundred fifty-one thousand, eight hundred one".