197247857 has 2 divisors, whose sum is σ = 197247858. Its totient is φ = 197247856.

The previous prime is 197247829. The next prime is 197247859. The reversal of 197247857 is 758742791.

It is a happy number.

197247857 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., 111851776 + 85396081 = 10576^2 + 9241^2 .

It is a cyclic number.

It is not a de Polignac number, because 197247857 - 2⁸ = 197247601 is a prime.

Together with 197247859, 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 (197247859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98623928 + 98623929.

It is an arithmetic number, because the mean of its divisors is an integer number (98623929).

Almost surely, 2^197247857 is an apocalyptic number.

It is an amenable number.

197247857 is a deficient number, since it is larger than the sum of its proper divisors (1).

197247857 is an equidigital number, since it uses as much as digits as its factorization.

197247857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 987840, while the sum is 50.

The square root of 197247857 is about 14044.4956121607. The cubic root of 197247857 is about 582.1087103016.

The spelling of 197247857 in words is "one hundred ninety-seven million, two hundred forty-seven thousand, eight hundred fifty-seven".