197497871 has 2 divisors, whose sum is σ = 197497872. Its totient is φ = 197497870.

The previous prime is 197497841. The next prime is 197497873. The reversal of 197497871 is 178794791.

It is a happy number.

197497871 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 is a cyclic number.

It is not a de Polignac number, because 197497871 - 2¹⁰ = 197496847 is a prime.

Together with 197497873, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197497873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98748935 + 98748936.

It is an arithmetic number, because the mean of its divisors is an integer number (98748936).

Almost surely, 2^197497871 is an apocalyptic number.

197497871 is a deficient number, since it is larger than the sum of its proper divisors (1).

197497871 is an equidigital number, since it uses as much as digits as its factorization.

197497871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 889056, while the sum is 53.

The square root of 197497871 is about 14053.3935759303. The cubic root of 197497871 is about 582.3545496960.

The spelling of 197497871 in words is "one hundred ninety-seven million, four hundred ninety-seven thousand, eight hundred seventy-one".