197389217 has 2 divisors, whose sum is σ = 197389218. Its totient is φ = 197389216.

The previous prime is 197389201. The next prime is 197389219. The reversal of 197389217 is 712983791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 163737616 + 33651601 = 12796^2 + 5801^2 .

It is a cyclic number.

It is not a de Polignac number, because 197389217 - 2⁴ = 197389201 is a prime.

It is a super-3 number, since 3×197389217³ (a number of 26 digits) contains 333 as substring.

Together with 197389219, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (197389219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98694608 + 98694609.

It is an arithmetic number, because the mean of its divisors is an integer number (98694609).

Almost surely, 2^197389217 is an apocalyptic number.

It is an amenable number.

197389217 is a deficient number, since it is larger than the sum of its proper divisors (1).

197389217 is an equidigital number, since it uses as much as digits as its factorization.

197389217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 190512, while the sum is 47.

The square root of 197389217 is about 14049.5272874215. The cubic root of 197389217 is about 582.2477354501.

The spelling of 197389217 in words is "one hundred ninety-seven million, three hundred eighty-nine thousand, two hundred seventeen".