18311039 has 2 divisors, whose sum is σ = 18311040. Its totient is φ = 18311038.

The previous prime is 18311011. The next prime is 18311047. The reversal of 18311039 is 93011381.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18311039 - 2¹⁶ = 18245503 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18310999 and 18311017.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18311239) 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 as a sum of consecutive naturals, namely, 9155519 + 9155520.

It is an arithmetic number, because the mean of its divisors is an integer number (9155520).

Almost surely, 2^18311039 is an apocalyptic number.

18311039 is a deficient number, since it is larger than the sum of its proper divisors (1).

18311039 is an equidigital number, since it uses as much as digits as its factorization.

18311039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 18311039 is about 4279.1399836883. The cubic root of 18311039 is about 263.5750691972.

The spelling of 18311039 in words is "eighteen million, three hundred eleven thousand, thirty-nine".