18809339281 has 4 divisors (see below), whose sum is σ = 18811310832. Its totient is φ = 18807367732.

The previous prime is 18809339273. The next prime is 18809339327. The reversal of 18809339281 is 18293390881.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18809339281 - 2³ = 18809339273 is a prime.

It is a super-2 number, since 2×18809339281² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18809339251) 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, 971395 + ... + 990568.

It is an arithmetic number, because the mean of its divisors is an integer number (4702827708).

Almost surely, 2^18809339281 is an apocalyptic number.

It is an amenable number.

18809339281 is a deficient number, since it is larger than the sum of its proper divisors (1971551).

18809339281 is an equidigital number, since it uses as much as digits as its factorization.

18809339281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1971550.

The product of its (nonzero) digits is 746496, while the sum is 52.

The spelling of 18809339281 in words is "eighteen billion, eight hundred nine million, three hundred thirty-nine thousand, two hundred eighty-one".