18281023 has 2 divisors, whose sum is σ = 18281024. Its totient is φ = 18281022.

The previous prime is 18280993. The next prime is 18281033. The reversal of 18281023 is 32018281.

It is a strong prime.

It is an emirp because it is prime and its reverse (32018281) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18281023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18281033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9140511 + 9140512.

It is an arithmetic number, because the mean of its divisors is an integer number (9140512).

Almost surely, 2^18281023 is an apocalyptic number.

18281023 is a deficient number, since it is larger than the sum of its proper divisors (1).

18281023 is an equidigital number, since it uses as much as digits as its factorization.

18281023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 18281023 is about 4275.6312984166. The cubic root of 18281023 is about 263.4309703993.

The spelling of 18281023 in words is "eighteen million, two hundred eighty-one thousand, twenty-three".