199286993 has 2 divisors, whose sum is σ = 199286994. Its totient is φ = 199286992.

The previous prime is 199286987. The next prime is 199287013. The reversal of 199286993 is 399682991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199176769 + 110224 = 14113^2 + 332^2 .

It is a cyclic number.

It is not a de Polignac number, because 199286993 - 2⁴ = 199286977 is a prime.

It is not a weakly prime, because it can be changed into another prime (199286933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99643496 + 99643497.

It is an arithmetic number, because the mean of its divisors is an integer number (99643497).

Almost surely, 2^199286993 is an apocalyptic number.

It is an amenable number.

199286993 is a deficient number, since it is larger than the sum of its proper divisors (1).

199286993 is an equidigital number, since it uses as much as digits as its factorization.

199286993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1889568, while the sum is 56.

The square root of 199286993 is about 14116.9045119672. The cubic root of 199286993 is about 584.1077717928.

The spelling of 199286993 in words is "one hundred ninety-nine million, two hundred eighty-six thousand, nine hundred ninety-three".