197688871 has 2 divisors, whose sum is σ = 197688872. Its totient is φ = 197688870.

The previous prime is 197688857. The next prime is 197688877. The reversal of 197688871 is 178886791.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197688871 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197688877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98844435 + 98844436.

It is an arithmetic number, because the mean of its divisors is an integer number (98844436).

Almost surely, 2^197688871 is an apocalyptic number.

197688871 is a deficient number, since it is larger than the sum of its proper divisors (1).

197688871 is an equidigital number, since it uses as much as digits as its factorization.

197688871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1354752, while the sum is 55.

The square root of 197688871 is about 14060.1874454077. The cubic root of 197688871 is about 582.5422207174.

The spelling of 197688871 in words is "one hundred ninety-seven million, six hundred eighty-eight thousand, eight hundred seventy-one".