195717187 has 2 divisors, whose sum is σ = 195717188. Its totient is φ = 195717186.

The previous prime is 195717173. The next prime is 195717199. The reversal of 195717187 is 781717591.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-195717187 is a prime.

It is not a weakly prime, because it can be changed into another prime (195757187) 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, 97858593 + 97858594.

It is an arithmetic number, because the mean of its divisors is an integer number (97858594).

Almost surely, 2^195717187 is an apocalyptic number.

195717187 is a deficient number, since it is larger than the sum of its proper divisors (1).

195717187 is an equidigital number, since it uses as much as digits as its factorization.

195717187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 123480, while the sum is 46.

The square root of 195717187 is about 13989.8958895340. The cubic root of 195717187 is about 580.5990510947.

The spelling of 195717187 in words is "one hundred ninety-five million, seven hundred seventeen thousand, one hundred eighty-seven".