18181039 has 2 divisors, whose sum is σ = 18181040. Its totient is φ = 18181038.

The previous prime is 18181021. The next prime is 18181103. The reversal of 18181039 is 93018181.

It is a weak prime.

It is an emirp because it is prime and its reverse (93018181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18181039 - 2⁹ = 18180527 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18181039.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18181439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9090519 + 9090520.

It is an arithmetic number, because the mean of its divisors is an integer number (9090520).

Almost surely, 2^18181039 is an apocalyptic number.

18181039 is a deficient number, since it is larger than the sum of its proper divisors (1).

18181039 is an equidigital number, since it uses as much as digits as its factorization.

18181039 is an odious number, because the sum of its binary digits is odd.

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

The square root of 18181039 is about 4263.9229589663. The cubic root of 18181039 is about 262.9498330872.

The spelling of 18181039 in words is "eighteen million, one hundred eighty-one thousand, thirty-nine".