195188857 has 2 divisors, whose sum is σ = 195188858. Its totient is φ = 195188856.

The previous prime is 195188839. The next prime is 195188891. The reversal of 195188857 is 758881591.

195188857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 195188841 + 16 = 13971^2 + 4^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-195188857 is a prime.

It is not a weakly prime, because it can be changed into another prime (195188897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97594428 + 97594429.

It is an arithmetic number, because the mean of its divisors is an integer number (97594429).

Almost surely, 2^195188857 is an apocalyptic number.

It is an amenable number.

195188857 is a deficient number, since it is larger than the sum of its proper divisors (1).

195188857 is an equidigital number, since it uses as much as digits as its factorization.

195188857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 806400, while the sum is 52.

The square root of 195188857 is about 13971.0005726147. Note that the first 3 decimals coincide. The cubic root of 195188857 is about 580.0761463640.

The spelling of 195188857 in words is "one hundred ninety-five million, one hundred eighty-eight thousand, eight hundred fifty-seven".