195859987 has 2 divisors, whose sum is σ = 195859988. Its totient is φ = 195859986.

The previous prime is 195859943. The next prime is 195860003. The reversal of 195859987 is 789958591.

195859987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-195859987 is a prime.

It is a super-2 number, since 2×195859987² = 76722269015280338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (195850987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97929993 + 97929994.

It is an arithmetic number, because the mean of its divisors is an integer number (97929994).

Almost surely, 2^195859987 is an apocalyptic number.

195859987 is a deficient number, since it is larger than the sum of its proper divisors (1).

195859987 is an equidigital number, since it uses as much as digits as its factorization.

195859987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8164800, while the sum is 61.

The square root of 195859987 is about 13994.9986423722. The cubic root of 195859987 is about 580.7402231428.

The spelling of 195859987 in words is "one hundred ninety-five million, eight hundred fifty-nine thousand, nine hundred eighty-seven".