18143331 has 12 divisors (see below), whose sum is σ = 24667608. Its totient is φ = 11861824.

The previous prime is 18143329. The next prime is 18143341. The reversal of 18143331 is 13334181.

It is not a de Polignac number, because 18143331 - 2¹ = 18143329 is a prime.

It is a super-2 number, since 2×18143331² = 658360919551122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18143311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7351 + ... + 9503.

It is an arithmetic number, because the mean of its divisors is an integer number (2055634).

It is a self-describing number.

Almost surely, 2^18143331 is an apocalyptic number.

18143331 is a deficient number, since it is larger than the sum of its proper divisors (6524277).

18143331 is an equidigital number, since it uses as much as digits as its factorization.

18143331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2262 (or 2209 counting only the distinct ones).

The product of its digits is 864, while the sum is 24.

The square root of 18143331 is about 4259.4989141917. The cubic root of 18143331 is about 262.7679187479.

The spelling of 18143331 in words is "eighteen million, one hundred forty-three thousand, three hundred thirty-one".