18311099 has 4 divisors (see below), whose sum is σ = 18379440. Its totient is φ = 18242760.

The previous prime is 18311087. The next prime is 18311107. The reversal of 18311099 is 99011381.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18311099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18311039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33767 + ... + 34304.

It is an arithmetic number, because the mean of its divisors is an integer number (4594860).

Almost surely, 2^18311099 is an apocalyptic number.

18311099 is a deficient number, since it is larger than the sum of its proper divisors (68341).

18311099 is an equidigital number, since it uses as much as digits as its factorization.

18311099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68340.

The product of its (nonzero) digits is 1944, while the sum is 32.

The square root of 18311099 is about 4279.1469944371. The cubic root of 18311099 is about 263.5753570834.

The spelling of 18311099 in words is "eighteen million, three hundred eleven thousand, ninety-nine".