199056857 has 2 divisors, whose sum is σ = 199056858. Its totient is φ = 199056856.

The previous prime is 199056829. The next prime is 199056883. The reversal of 199056857 is 758650991.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166384201 + 32672656 = 12899^2 + 5716^2 .

It is a cyclic number.

It is not a de Polignac number, because 199056857 - 2¹⁰ = 199055833 is a prime.

It is not a weakly prime, because it can be changed into another prime (199056457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99528428 + 99528429.

It is an arithmetic number, because the mean of its divisors is an integer number (99528429).

Almost surely, 2^199056857 is an apocalyptic number.

It is an amenable number.

199056857 is a deficient number, since it is larger than the sum of its proper divisors (1).

199056857 is an equidigital number, since it uses as much as digits as its factorization.

199056857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 680400, while the sum is 50.

The square root of 199056857 is about 14108.7510786745. The cubic root of 199056857 is about 583.8828432419.

It can be divided in two parts, 19905 and 6857, that added together give a palindrome (26762).

The spelling of 199056857 in words is "one hundred ninety-nine million, fifty-six thousand, eight hundred fifty-seven".