18109381000 has 32 divisors (see below), whose sum is σ = 42375953880. Its totient is φ = 7243752000.

The previous prime is 18109380967. The next prime is 18109381007. The reversal of 18109381000 is 18390181.

It can be written as a sum of positive squares in 4 ways, for example, as 11977551364 + 6131829636 = 109442^2 + 78306^2 .

It is a super-2 number, since 2×18109381000² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18109381007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9053691 + ... + 9055690.

Almost surely, 2^18109381000 is an apocalyptic number.

18109381000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18109381000 is an abundant number, since it is smaller than the sum of its proper divisors (24266572880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18109381000 is a wasteful number, since it uses less digits than its factorization.

18109381000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18109402 (or 18109388 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 31.

The spelling of 18109381000 in words is "eighteen billion, one hundred nine million, three hundred eighty-one thousand".