18125911 has 2 divisors, whose sum is σ = 18125912. Its totient is φ = 18125910.

The previous prime is 18125903. The next prime is 18125929. The reversal of 18125911 is 11952181.

It is a weak prime.

It is an emirp because it is prime and its reverse (11952181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18125911 - 2³ = 18125903 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18125911.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18125941) 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, 9062955 + 9062956.

It is an arithmetic number, because the mean of its divisors is an integer number (9062956).

Almost surely, 2^18125911 is an apocalyptic number.

18125911 is a deficient number, since it is larger than the sum of its proper divisors (1).

18125911 is an equidigital number, since it uses as much as digits as its factorization.

18125911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 28.

The square root of 18125911 is about 4257.4535816612. The cubic root of 18125911 is about 262.6837944875.

The spelling of 18125911 in words is "eighteen million, one hundred twenty-five thousand, nine hundred eleven".