18264881 has 2 divisors, whose sum is σ = 18264882. Its totient is φ = 18264880.

The previous prime is 18264853. The next prime is 18264893. The reversal of 18264881 is 18846281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10784656 + 7480225 = 3284^2 + 2735^2 .

It is a cyclic number.

It is not a de Polignac number, because 18264881 - 2¹⁸ = 18002737 is a prime.

It is a super-2 number, since 2×18264881² = 667211755888322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18264481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9132440 + 9132441.

It is an arithmetic number, because the mean of its divisors is an integer number (9132441).

Almost surely, 2^18264881 is an apocalyptic number.

It is an amenable number.

18264881 is a deficient number, since it is larger than the sum of its proper divisors (1).

18264881 is an equidigital number, since it uses as much as digits as its factorization.

18264881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24576, while the sum is 38.

The square root of 18264881 is about 4273.7432070727. The cubic root of 18264881 is about 263.3534117397.

The spelling of 18264881 in words is "eighteen million, two hundred sixty-four thousand, eight hundred eighty-one".