18331297 has 4 divisors (see below), whose sum is σ = 18552240. Its totient is φ = 18110356.

The previous prime is 18331289. The next prime is 18331301. The reversal of 18331297 is 79213381.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79213381 = 13 ⋅6093337.

It is a cyclic number.

It is not a de Polignac number, because 18331297 - 2³ = 18331289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18331217) 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 in 3 ways as a sum of consecutive naturals, for example, 110347 + ... + 110512.

It is an arithmetic number, because the mean of its divisors is an integer number (4638060).

Almost surely, 2^18331297 is an apocalyptic number.

It is an amenable number.

18331297 is a deficient number, since it is larger than the sum of its proper divisors (220943).

18331297 is an equidigital number, since it uses as much as digits as its factorization.

18331297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220942.

The product of its digits is 9072, while the sum is 34.

The square root of 18331297 is about 4281.5063937825. The cubic root of 18331297 is about 263.6722334612.

The spelling of 18331297 in words is "eighteen million, three hundred thirty-one thousand, two hundred ninety-seven".