18001099 has 2 divisors, whose sum is σ = 18001100. Its totient is φ = 18001098.

The previous prime is 18001073. The next prime is 18001117. The reversal of 18001099 is 99010081.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18001099 - 2⁷ = 18000971 is a prime.

It is not a weakly prime, because it can be changed into another prime (18001069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9000549 + 9000550.

It is an arithmetic number, because the mean of its divisors is an integer number (9000550).

Almost surely, 2^18001099 is an apocalyptic number.

18001099 is a deficient number, since it is larger than the sum of its proper divisors (1).

18001099 is an equidigital number, since it uses as much as digits as its factorization.

18001099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 18001099 is about 4242.7702035345. The cubic root of 18001099 is about 262.0794730064.

The spelling of 18001099 in words is "eighteen million, one thousand, ninety-nine".