18380031209 has 4 divisors (see below), whose sum is σ = 18638904960. Its totient is φ = 18121157460.

The previous prime is 18380031157. The next prime is 18380031221. The reversal of 18380031209 is 90213008381.

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 a de Polignac number, because none of the positive numbers 2^k-18380031209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18380031289) 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, 129436769 + ... + 129436910.

It is an arithmetic number, because the mean of its divisors is an integer number (4659726240).

Almost surely, 2^18380031209 is an apocalyptic number.

It is an amenable number.

18380031209 is a deficient number, since it is larger than the sum of its proper divisors (258873751).

18380031209 is an equidigital number, since it uses as much as digits as its factorization.

18380031209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258873750.

The product of its (nonzero) digits is 10368, while the sum is 35.

The spelling of 18380031209 in words is "eighteen billion, three hundred eighty million, thirty-one thousand, two hundred nine".