195985879 has 2 divisors, whose sum is σ = 195985880. Its totient is φ = 195985878.

The previous prime is 195985871. The next prime is 195985897. The reversal of 195985879 is 978589591.

Together with next prime (195985897) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 195985879 - 2³ = 195985871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195985871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97992939 + 97992940.

It is an arithmetic number, because the mean of its divisors is an integer number (97992940).

Almost surely, 2^195985879 is an apocalyptic number.

195985879 is a deficient number, since it is larger than the sum of its proper divisors (1).

195985879 is an equidigital number, since it uses as much as digits as its factorization.

195985879 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 195985879 is about 13999.4956694875. The cubic root of 195985879 is about 580.8646230446.

The spelling of 195985879 in words is "one hundred ninety-five million, nine hundred eighty-five thousand, eight hundred seventy-nine".