18231266 has 4 divisors (see below), whose sum is σ = 27346902. Its totient is φ = 9115632.

The previous prime is 18231229. The next prime is 18231271. The reversal of 18231266 is 66213281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66213281 = 59 ⋅1122259.

It can be written as a sum of positive squares in only one way, i.e., 11703241 + 6528025 = 3421^2 + 2555^2 .

It is an unprimeable number.

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, 4557815 + ... + 4557818.

Almost surely, 2^18231266 is an apocalyptic number.

18231266 is a deficient number, since it is larger than the sum of its proper divisors (9115636).

18231266 is an equidigital number, since it uses as much as digits as its factorization.

18231266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9115635.

The product of its digits is 3456, while the sum is 29.

The square root of 18231266 is about 4269.8086608184. The cubic root of 18231266 is about 263.1917524816.

The spelling of 18231266 in words is "eighteen million, two hundred thirty-one thousand, two hundred sixty-six".