209498197 has 2 divisors, whose sum is σ = 209498198. Its totient is φ = 209498196.

The previous prime is 209498143. The next prime is 209498207. The reversal of 209498197 is 791894902.

209498197 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 209496676 + 1521 = 14474^2 + 39^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209498197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 209498197.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209498137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104749098 + 104749099.

It is an arithmetic number, because the mean of its divisors is an integer number (104749099).

Almost surely, 2^209498197 is an apocalyptic number.

It is an amenable number.

209498197 is a deficient number, since it is larger than the sum of its proper divisors (1).

209498197 is an equidigital number, since it uses as much as digits as its factorization.

209498197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 49.

The square root of 209498197 is about 14474.0525423946. The cubic root of 209498197 is about 593.9183767418.

The spelling of 209498197 in words is "two hundred nine million, four hundred ninety-eight thousand, one hundred ninety-seven".