18219017 has 2 divisors, whose sum is σ = 18219018. Its totient is φ = 18219016.

The previous prime is 18219001. The next prime is 18219037. The reversal of 18219017 is 71091281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12187081 + 6031936 = 3491^2 + 2456^2 .

It is an emirp because it is prime and its reverse (71091281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18219017 - 2⁴ = 18219001 is a prime.

It is not a weakly prime, because it can be changed into another prime (18219037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9109508 + 9109509.

It is an arithmetic number, because the mean of its divisors is an integer number (9109509).

Almost surely, 2^18219017 is an apocalyptic number.

It is an amenable number.

18219017 is a deficient number, since it is larger than the sum of its proper divisors (1).

18219017 is an equidigital number, since it uses as much as digits as its factorization.

18219017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 29.

The square root of 18219017 is about 4268.3740464022. The cubic root of 18219017 is about 263.1327959242.

The spelling of 18219017 in words is "eighteen million, two hundred nineteen thousand, seventeen".