18831109 has 12 divisors (see below), whose sum is σ = 21790720. Its totient is φ = 16216200.

The previous prime is 18831107. The next prime is 18831139. The reversal of 18831109 is 90113881.

It is not a de Polignac number, because 18831109 - 2¹ = 18831107 is a prime.

It is a super-2 number, since 2×18831109² = 709221332339762, which contains 22 as substring.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18831107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1797 + ... + 6394.

Almost surely, 2^18831109 is an apocalyptic number.

18831109 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18831109 is a deficient number, since it is larger than the sum of its proper divisors (2959611).

18831109 is a wasteful number, since it uses less digits than its factorization.

18831109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8232 (or 8221 counting only the distinct ones).

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

The square root of 18831109 is about 4339.4825728421. The cubic root of 18831109 is about 266.0471631374.

It can be divided in two parts, 1883 and 1109, that added together give a palindrome (2992).

The spelling of 18831109 in words is "eighteen million, eight hundred thirty-one thousand, one hundred nine".