187668197 has 2 divisors, whose sum is σ = 187668198. Its totient is φ = 187668196.

The previous prime is 187668137. The next prime is 187668199. The reversal of 187668197 is 791866781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 187169761 + 498436 = 13681^2 + 706^2 .

It is a cyclic number.

It is not a de Polignac number, because 187668197 - 2¹⁰ = 187667173 is a prime.

Together with 187668199, 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 (187668199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93834098 + 93834099.

It is an arithmetic number, because the mean of its divisors is an integer number (93834099).

Almost surely, 2^187668197 is an apocalyptic number.

It is an amenable number.

187668197 is a deficient number, since it is larger than the sum of its proper divisors (1).

187668197 is an equidigital number, since it uses as much as digits as its factorization.

187668197 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 187668197 is about 13699.2042469627. The cubic root of 187668197 is about 572.5282145728.

The spelling of 187668197 in words is "one hundred eighty-seven million, six hundred sixty-eight thousand, one hundred ninety-seven".