18043931 has 2 divisors, whose sum is σ = 18043932. Its totient is φ = 18043930.

The previous prime is 18043913. The next prime is 18043933. The reversal of 18043931 is 13934081.

Together with previous prime (18043913) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18043931 - 2⁶ = 18043867 is a prime.

It is a super-2 number, since 2×18043931² = 651166891865522, which contains 22 as substring.

Together with 18043933, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18043894 and 18043903.

It is not a weakly prime, because it can be changed into another prime (18043933) 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 as a sum of consecutive naturals, namely, 9021965 + 9021966.

It is an arithmetic number, because the mean of its divisors is an integer number (9021966).

Almost surely, 2^18043931 is an apocalyptic number.

18043931 is a deficient number, since it is larger than the sum of its proper divisors (1).

18043931 is an equidigital number, since it uses as much as digits as its factorization.

18043931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 18043931 is about 4247.8148500141. The cubic root of 18043931 is about 262.2871732228.

The spelling of 18043931 in words is "eighteen million, forty-three thousand, nine hundred thirty-one".