197877971 has 2 divisors, whose sum is σ = 197877972. Its totient is φ = 197877970.

The previous prime is 197877949. The next prime is 197877973. The reversal of 197877971 is 179778791.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 197877971 - 2⁶ = 197877907 is a prime.

Together with 197877973, 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 (197877973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98938985 + 98938986.

It is an arithmetic number, because the mean of its divisors is an integer number (98938986).

Almost surely, 2^197877971 is an apocalyptic number.

197877971 is a deficient number, since it is larger than the sum of its proper divisors (1).

197877971 is an equidigital number, since it uses as much as digits as its factorization.

197877971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1555848, while the sum is 56.

The square root of 197877971 is about 14066.9104994665. The cubic root of 197877971 is about 582.7279058089.

The spelling of 197877971 in words is "one hundred ninety-seven million, eight hundred seventy-seven thousand, nine hundred seventy-one".