197942257 has 2 divisors, whose sum is σ = 197942258. Its totient is φ = 197942256.

The previous prime is 197942243. The next prime is 197942263. The reversal of 197942257 is 752249791.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196868961 + 1073296 = 14031^2 + 1036^2 .

It is a cyclic number.

It is not a de Polignac number, because 197942257 - 2¹⁵ = 197909489 is a prime.

It is a super-2 number, since 2×197942257² = 78362274212508098, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (197942357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98971128 + 98971129.

It is an arithmetic number, because the mean of its divisors is an integer number (98971129).

Almost surely, 2^197942257 is an apocalyptic number.

It is an amenable number.

197942257 is a deficient number, since it is larger than the sum of its proper divisors (1).

197942257 is an equidigital number, since it uses as much as digits as its factorization.

197942257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 317520, while the sum is 46.

The square root of 197942257 is about 14069.1953216948. The cubic root of 197942257 is about 582.7910039395.

The spelling of 197942257 in words is "one hundred ninety-seven million, nine hundred forty-two thousand, two hundred fifty-seven".