209061317 has 2 divisors, whose sum is σ = 209061318. Its totient is φ = 209061316.

The previous prime is 209061301. The next prime is 209061323. The reversal of 209061317 is 713160902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108139201 + 100922116 = 10399^2 + 10046^2 .

It is a cyclic number.

It is not a de Polignac number, because 209061317 - 2⁴ = 209061301 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 209061317.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209061397) 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, 104530658 + 104530659.

It is an arithmetic number, because the mean of its divisors is an integer number (104530659).

Almost surely, 2^209061317 is an apocalyptic number.

It is an amenable number.

209061317 is a deficient number, since it is larger than the sum of its proper divisors (1).

209061317 is an equidigital number, since it uses as much as digits as its factorization.

209061317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 209061317 is about 14458.9528320691. The cubic root of 209061317 is about 593.5052440955.

The spelling of 209061317 in words is "two hundred nine million, sixty-one thousand, three hundred seventeen".