209117593 has 2 divisors, whose sum is σ = 209117594. Its totient is φ = 209117592.

The previous prime is 209117569. The next prime is 209117611. The reversal of 209117593 is 395711902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 206583129 + 2534464 = 14373^2 + 1592^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209117593 is a prime.

It is a super-2 number, since 2×209117593² = 87460335404227298, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (209117393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104558796 + 104558797.

It is an arithmetic number, because the mean of its divisors is an integer number (104558797).

Almost surely, 2^209117593 is an apocalyptic number.

It is an amenable number.

209117593 is a deficient number, since it is larger than the sum of its proper divisors (1).

209117593 is an equidigital number, since it uses as much as digits as its factorization.

209117593 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17010, while the sum is 37.

The square root of 209117593 is about 14460.8987618336. The cubic root of 209117593 is about 593.5584933928.

The spelling of 209117593 in words is "two hundred nine million, one hundred seventeen thousand, five hundred ninety-three".