18311323 has 2 divisors, whose sum is σ = 18311324. Its totient is φ = 18311322.

The previous prime is 18311291. The next prime is 18311327. The reversal of 18311323 is 32311381.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18311323 - 2⁵ = 18311291 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18311294 and 18311303.

It is not a weakly prime, because it can be changed into another prime (18311327) 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, 9155661 + 9155662.

It is an arithmetic number, because the mean of its divisors is an integer number (9155662).

Almost surely, 2^18311323 is an apocalyptic number.

18311323 is a deficient number, since it is larger than the sum of its proper divisors (1).

18311323 is an equidigital number, since it uses as much as digits as its factorization.

18311323 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 22.

The square root of 18311323 is about 4279.1731677977. The cubic root of 18311323 is about 263.5764318531.

The spelling of 18311323 in words is "eighteen million, three hundred eleven thousand, three hundred twenty-three".