209297323 has 2 divisors, whose sum is σ = 209297324. Its totient is φ = 209297322.

The previous prime is 209297311. The next prime is 209297329. The reversal of 209297323 is 323792902.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209297323 is a prime.

It is not a weakly prime, because it can be changed into another prime (209297329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104648661 + 104648662.

It is an arithmetic number, because the mean of its divisors is an integer number (104648662).

Almost surely, 2^209297323 is an apocalyptic number.

209297323 is a deficient number, since it is larger than the sum of its proper divisors (1).

209297323 is an equidigital number, since it uses as much as digits as its factorization.

209297323 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 37.

The square root of 209297323 is about 14467.1117711864. Note that the first 3 decimals coincide. The cubic root of 209297323 is about 593.7284929901.

The spelling of 209297323 in words is "two hundred nine million, two hundred ninety-seven thousand, three hundred twenty-three".