18316849 has 2 divisors, whose sum is σ = 18316850. Its totient is φ = 18316848.

The previous prime is 18316819. The next prime is 18316867. The reversal of 18316849 is 94861381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13927824 + 4389025 = 3732^2 + 2095^2 .

It is an emirp because it is prime and its reverse (94861381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18316849 - 2¹⁹ = 17792561 is a prime.

It is not a weakly prime, because it can be changed into another prime (18316819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9158424 + 9158425.

It is an arithmetic number, because the mean of its divisors is an integer number (9158425).

Almost surely, 2^18316849 is an apocalyptic number.

It is an amenable number.

18316849 is a deficient number, since it is larger than the sum of its proper divisors (1).

18316849 is an equidigital number, since it uses as much as digits as its factorization.

18316849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 40.

The square root of 18316849 is about 4279.8188045757. The cubic root of 18316849 is about 263.6029432611.

The spelling of 18316849 in words is "eighteen million, three hundred sixteen thousand, eight hundred forty-nine".