209223109 has 2 divisors, whose sum is σ = 209223110. Its totient is φ = 209223108.

The previous prime is 209223103. The next prime is 209223121. The reversal of 209223109 is 901322902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 194184225 + 15038884 = 13935^2 + 3878^2 .

It is a cyclic number.

It is not a de Polignac number, because 209223109 - 2³ = 209223101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209223101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104611554 + 104611555.

It is an arithmetic number, because the mean of its divisors is an integer number (104611555).

Almost surely, 2^209223109 is an apocalyptic number.

It is an amenable number.

209223109 is a deficient number, since it is larger than the sum of its proper divisors (1).

209223109 is an equidigital number, since it uses as much as digits as its factorization.

209223109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 209223109 is about 14464.5466226909. The cubic root of 209223109 is about 593.6583086629.

The spelling of 209223109 in words is "two hundred nine million, two hundred twenty-three thousand, one hundred nine".