209970899 has 2 divisors, whose sum is σ = 209970900. Its totient is φ = 209970898.

The previous prime is 209970853. The next prime is 209970913. The reversal of 209970899 is 998079902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 209970899 - 2²⁰ = 208922323 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 209970899.

It is not a weakly prime, because it can be changed into another prime (209970829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104985449 + 104985450.

It is an arithmetic number, because the mean of its divisors is an integer number (104985450).

Almost surely, 2^209970899 is an apocalyptic number.

209970899 is a deficient number, since it is larger than the sum of its proper divisors (1).

209970899 is an equidigital number, since it uses as much as digits as its factorization.

209970899 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 734832, while the sum is 53.

The square root of 209970899 is about 14490.3726315095. The cubic root of 209970899 is about 594.3647378059.

The spelling of 209970899 in words is "two hundred nine million, nine hundred seventy thousand, eight hundred ninety-nine".