197885791 has 2 divisors, whose sum is σ = 197885792. Its totient is φ = 197885790.

The previous prime is 197885719. The next prime is 197885801. The reversal of 197885791 is 197588791.

Together with previous prime (197885719) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 197885791 - 2⁷ = 197885663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197885291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98942895 + 98942896.

It is an arithmetic number, because the mean of its divisors is an integer number (98942896).

Almost surely, 2^197885791 is an apocalyptic number.

197885791 is a deficient number, since it is larger than the sum of its proper divisors (1).

197885791 is an equidigital number, since it uses as much as digits as its factorization.

197885791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1270080, while the sum is 55.

The square root of 197885791 is about 14067.1884539875. The cubic root of 197885791 is about 582.7355820419.

The spelling of 197885791 in words is "one hundred ninety-seven million, eight hundred eighty-five thousand, seven hundred ninety-one".