209198069 has 2 divisors, whose sum is σ = 209198070. Its totient is φ = 209198068.

The previous prime is 209198051. The next prime is 209198117. The reversal of 209198069 is 960891902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197739844 + 11458225 = 14062^2 + 3385^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209198069 is a prime.

It is a super-2 number, since 2×209198069² = 87527664146657522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209198029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104599034 + 104599035.

It is an arithmetic number, because the mean of its divisors is an integer number (104599035).

Almost surely, 2^209198069 is an apocalyptic number.

It is an amenable number.

209198069 is a deficient number, since it is larger than the sum of its proper divisors (1).

209198069 is an equidigital number, since it uses as much as digits as its factorization.

209198069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 209198069 is about 14463.6810321578. The cubic root of 209198069 is about 593.6346245405.

The spelling of 209198069 in words is "two hundred nine million, one hundred ninety-eight thousand, sixty-nine".