222099809 has 2 divisors, whose sum is σ = 222099810. Its totient is φ = 222099808.

The previous prime is 222099803. The next prime is 222099853. The reversal of 222099809 is 908990222.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 222099409 + 400 = 14903^2 + 20^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222099809 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (222099803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111049904 + 111049905.

It is an arithmetic number, because the mean of its divisors is an integer number (111049905).

Almost surely, 2^222099809 is an apocalyptic number.

It is an amenable number.

222099809 is a deficient number, since it is larger than the sum of its proper divisors (1).

222099809 is an equidigital number, since it uses as much as digits as its factorization.

222099809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 222099809 is about 14903.0134201107. The cubic root of 222099809 is about 605.5956240555.

The spelling of 222099809 in words is "two hundred twenty-two million, ninety-nine thousand, eight hundred nine".