18135499 has 2 divisors, whose sum is σ = 18135500. Its totient is φ = 18135498.

The previous prime is 18135457. The next prime is 18135517. The reversal of 18135499 is 99453181.

It is a strong prime.

It is an emirp because it is prime and its reverse (99453181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18135499 - 2⁷ = 18135371 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18135409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9067749 + 9067750.

It is an arithmetic number, because the mean of its divisors is an integer number (9067750).

Almost surely, 2^18135499 is an apocalyptic number.

18135499 is a deficient number, since it is larger than the sum of its proper divisors (1).

18135499 is an equidigital number, since it uses as much as digits as its factorization.

18135499 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 40.

The square root of 18135499 is about 4258.5794579883. The cubic root of 18135499 is about 262.7301033004.

The spelling of 18135499 in words is "eighteen million, one hundred thirty-five thousand, four hundred ninety-nine".