18122539 has 2 divisors, whose sum is σ = 18122540. Its totient is φ = 18122538.

The previous prime is 18122509. The next prime is 18122543. The reversal of 18122539 is 93522181.

It is a strong prime.

It is an emirp because it is prime and its reverse (93522181) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18122539 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18122539.

It is not a weakly prime, because it can be changed into another prime (18122509) 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, 9061269 + 9061270.

It is an arithmetic number, because the mean of its divisors is an integer number (9061270).

Almost surely, 2^18122539 is an apocalyptic number.

18122539 is a deficient number, since it is larger than the sum of its proper divisors (1).

18122539 is an equidigital number, since it uses as much as digits as its factorization.

18122539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 31.

The square root of 18122539 is about 4257.0575518778. The cubic root of 18122539 is about 262.6675042776.

The spelling of 18122539 in words is "eighteen million, one hundred twenty-two thousand, five hundred thirty-nine".