18214517 has 2 divisors, whose sum is σ = 18214518. Its totient is φ = 18214516.

The previous prime is 18214501. The next prime is 18214519. The reversal of 18214517 is 71541281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15673681 + 2540836 = 3959^2 + 1594^2 .

It is a cyclic number.

It is not a de Polignac number, because 18214517 - 2⁴ = 18214501 is a prime.

Together with 18214519, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18214517.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18214519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9107258 + 9107259.

It is an arithmetic number, because the mean of its divisors is an integer number (9107259).

Almost surely, 2^18214517 is an apocalyptic number.

It is an amenable number.

18214517 is a deficient number, since it is larger than the sum of its proper divisors (1).

18214517 is an equidigital number, since it uses as much as digits as its factorization.

18214517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2240, while the sum is 29.

The square root of 18214517 is about 4267.8468810397. The cubic root of 18214517 is about 263.1111300080. Note that the first 4 decimals are identical.

Adding to 18214517 its reverse (71541281), we get a palindrome (89755798).

The spelling of 18214517 in words is "eighteen million, two hundred fourteen thousand, five hundred seventeen".