197868791 has 2 divisors, whose sum is σ = 197868792. Its totient is φ = 197868790.

The previous prime is 197868773. The next prime is 197868809.

197868791 is nontrivially palindromic in base 10.

It is a balanced prime because it is at equal distance from previous prime (197868773) and next prime (197868809).

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 197868791 - 2²² = 193674487 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197868721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98934395 + 98934396.

It is an arithmetic number, because the mean of its divisors is an integer number (98934396).

Almost surely, 2^197868791 is an apocalyptic number.

197868791 is a deficient number, since it is larger than the sum of its proper divisors (1).

197868791 is an equidigital number, since it uses as much as digits as its factorization.

197868791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1524096, while the sum is 56.

The square root of 197868791 is about 14066.5841980205. The cubic root of 197868791 is about 582.7188943209.

The spelling of 197868791 in words is "one hundred ninety-seven million, eight hundred sixty-eight thousand, seven hundred ninety-one".