209306897 has 2 divisors, whose sum is σ = 209306898. Its totient is φ = 209306896.

The previous prime is 209306893. The next prime is 209306957. The reversal of 209306897 is 798603902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189227536 + 20079361 = 13756^2 + 4481^2 .

It is a cyclic number.

It is not a de Polignac number, because 209306897 - 2² = 209306893 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (209306893) 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, 104653448 + 104653449.

It is an arithmetic number, because the mean of its divisors is an integer number (104653449).

Almost surely, 2^209306897 is an apocalyptic number.

It is an amenable number.

209306897 is a deficient number, since it is larger than the sum of its proper divisors (1).

209306897 is an equidigital number, since it uses as much as digits as its factorization.

209306897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 209306897 is about 14467.4426558394. The cubic root of 209306897 is about 593.7375459327.

The spelling of 209306897 in words is "two hundred nine million, three hundred six thousand, eight hundred ninety-seven".