199355857 has 2 divisors, whose sum is σ = 199355858. Its totient is φ = 199355856.

The previous prime is 199355851. The next prime is 199355939. The reversal of 199355857 is 758553991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101425041 + 97930816 = 10071^2 + 9896^2 .

It is a cyclic number.

It is not a de Polignac number, because 199355857 - 2⁷ = 199355729 is a prime.

It is not a weakly prime, because it can be changed into another prime (199355851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99677928 + 99677929.

It is an arithmetic number, because the mean of its divisors is an integer number (99677929).

Almost surely, 2^199355857 is an apocalyptic number.

It is an amenable number.

199355857 is a deficient number, since it is larger than the sum of its proper divisors (1).

199355857 is an equidigital number, since it uses as much as digits as its factorization.

199355857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1701000, while the sum is 52.

The square root of 199355857 is about 14119.3433629188. The cubic root of 199355857 is about 584.1750438957.

The spelling of 199355857 in words is "one hundred ninety-nine million, three hundred fifty-five thousand, eight hundred fifty-seven".