90006209 has 2 divisors, whose sum is σ = 90006210. Its totient is φ = 90006208.

The previous prime is 90006179. The next prime is 90006221. The reversal of 90006209 is 90260009.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84125584 + 5880625 = 9172^2 + 2425^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90006209 is a prime.

It is a super-2 number, since 2×90006209² = 16202235317103362, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (90006229) 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, 45003104 + 45003105.

It is an arithmetic number, because the mean of its divisors is an integer number (45003105).

Almost surely, 2^90006209 is an apocalyptic number.

It is an amenable number.

90006209 is a deficient number, since it is larger than the sum of its proper divisors (1).

90006209 is an equidigital number, since it uses as much as digits as its factorization.

90006209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 90006209 is about 9487.1602178945. The cubic root of 90006209 is about 448.1507799899.

The spelling of 90006209 in words is "ninety million, six thousand, two hundred nine".