197166887 has 2 divisors, whose sum is σ = 197166888. Its totient is φ = 197166886.

The previous prime is 197166883. The next prime is 197166899. The reversal of 197166887 is 788661791.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 197166887 - 2² = 197166883 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197166881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98583443 + 98583444.

It is an arithmetic number, because the mean of its divisors is an integer number (98583444).

Almost surely, 2^197166887 is an apocalyptic number.

197166887 is a deficient number, since it is larger than the sum of its proper divisors (1).

197166887 is an equidigital number, since it uses as much as digits as its factorization.

197166887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 53.

The square root of 197166887 is about 14041.6126922800. The cubic root of 197166887 is about 582.0290477663.

The spelling of 197166887 in words is "one hundred ninety-seven million, one hundred sixty-six thousand, eight hundred eighty-seven".