199268591 has 2 divisors, whose sum is σ = 199268592. Its totient is φ = 199268590.

The previous prime is 199268557. The next prime is 199268609. The reversal of 199268591 is 195862991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 199268591 - 2¹⁰ = 199267567 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199268501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99634295 + 99634296.

It is an arithmetic number, because the mean of its divisors is an integer number (99634296).

Almost surely, 2^199268591 is an apocalyptic number.

199268591 is a deficient number, since it is larger than the sum of its proper divisors (1).

199268591 is an equidigital number, since it uses as much as digits as its factorization.

199268591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 349920, while the sum is 50.

The square root of 199268591 is about 14116.2527251392. The cubic root of 199268591 is about 584.0897925594.

The spelling of 199268591 in words is "one hundred ninety-nine million, two hundred sixty-eight thousand, five hundred ninety-one".