99985217 has 2 divisors, whose sum is σ = 99985218. Its totient is φ = 99985216.

The previous prime is 99985159. The next prime is 99985219. The reversal of 99985217 is 71258999.

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., 99281296 + 703921 = 9964^2 + 839^2 .

It is a cyclic number.

It is not a de Polignac number, because 99985217 - 2⁶ = 99985153 is a prime.

Together with 99985219, 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 (99985219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49992608 + 49992609.

It is an arithmetic number, because the mean of its divisors is an integer number (49992609).

Almost surely, 2^99985217 is an apocalyptic number.

It is an amenable number.

99985217 is a deficient number, since it is larger than the sum of its proper divisors (1).

99985217 is an equidigital number, since it uses as much as digits as its factorization.

99985217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 50.

The square root of 99985217 is about 9999.2608226808. The cubic root of 99985217 is about 464.1360100315.

The spelling of 99985217 in words is "ninety-nine million, nine hundred eighty-five thousand, two hundred seventeen".