18287249 has 2 divisors, whose sum is σ = 18287250. Its totient is φ = 18287248.

The previous prime is 18287221. The next prime is 18287261. The reversal of 18287249 is 94278281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16483600 + 1803649 = 4060^2 + 1343^2 .

It is an emirp because it is prime and its reverse (94278281) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18287249 is a prime.

It is not a weakly prime, because it can be changed into another prime (18287209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9143624 + 9143625.

It is an arithmetic number, because the mean of its divisors is an integer number (9143625).

Almost surely, 2^18287249 is an apocalyptic number.

It is an amenable number.

18287249 is a deficient number, since it is larger than the sum of its proper divisors (1).

18287249 is an equidigital number, since it uses as much as digits as its factorization.

18287249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 41.

The square root of 18287249 is about 4276.3593160538. The cubic root of 18287249 is about 263.4608727205.

The spelling of 18287249 in words is "eighteen million, two hundred eighty-seven thousand, two hundred forty-nine".