18850217 has 2 divisors, whose sum is σ = 18850218. Its totient is φ = 18850216.

The previous prime is 18850199. The next prime is 18850219. The reversal of 18850217 is 71205881.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12645136 + 6205081 = 3556^2 + 2491^2 .

It is a cyclic number.

It is not a de Polignac number, because 18850217 - 2¹⁶ = 18784681 is a prime.

Together with 18850219, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18850219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9425108 + 9425109.

It is an arithmetic number, because the mean of its divisors is an integer number (9425109).

Almost surely, 2^18850217 is an apocalyptic number.

It is an amenable number.

18850217 is a deficient number, since it is larger than the sum of its proper divisors (1).

18850217 is an equidigital number, since it uses as much as digits as its factorization.

18850217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 18850217 is about 4341.6836595957. The cubic root of 18850217 is about 266.1371190839.

It can be divided in two parts, 188 and 50217, that added together give a palindrome (50405).

The spelling of 18850217 in words is "eighteen million, eight hundred fifty thousand, two hundred seventeen".