18361219 has 2 divisors, whose sum is σ = 18361220. Its totient is φ = 18361218.

The previous prime is 18361193. The next prime is 18361223. The reversal of 18361219 is 91216381.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18361219 - 2¹⁵ = 18328451 is a prime.

It is a super-2 number, since 2×18361219² = 674268726331922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18361229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9180609 + 9180610.

It is an arithmetic number, because the mean of its divisors is an integer number (9180610).

Almost surely, 2^18361219 is an apocalyptic number.

18361219 is a deficient number, since it is larger than the sum of its proper divisors (1).

18361219 is an equidigital number, since it uses as much as digits as its factorization.

18361219 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 31.

The square root of 18361219 is about 4284.9992998833. Note that the first 3 decimals coincide. The cubic root of 18361219 is about 263.8156186920.

The spelling of 18361219 in words is "eighteen million, three hundred sixty-one thousand, two hundred nineteen".