18123331 has 2 divisors, whose sum is σ = 18123332. Its totient is φ = 18123330.

The previous prime is 18123323. The next prime is 18123361. The reversal of 18123331 is 13332181.

It is a weak prime.

It is an emirp because it is prime and its reverse (13332181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18123331 - 2³ = 18123323 is a prime.

It is a super-2 number, since 2×18123331² = 656910253071122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18123361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9061665 + 9061666.

It is an arithmetic number, because the mean of its divisors is an integer number (9061666).

It is a self-describing number.

Almost surely, 2^18123331 is an apocalyptic number.

18123331 is a deficient number, since it is larger than the sum of its proper divisors (1).

18123331 is an equidigital number, since it uses as much as digits as its factorization.

18123331 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 18123331 is about 4257.1505728597. The cubic root of 18123331 is about 262.6713306294.

The spelling of 18123331 in words is "eighteen million, one hundred twenty-three thousand, three hundred thirty-one".