199564811 has 2 divisors, whose sum is σ = 199564812. Its totient is φ = 199564810.

The previous prime is 199564787. The next prime is 199564817. The reversal of 199564811 is 118465991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 199564811 - 2¹⁰ = 199563787 is a prime.

It is a super-2 number, since 2×199564811² = 79652227578931442, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (199564817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99782405 + 99782406.

It is an arithmetic number, because the mean of its divisors is an integer number (99782406).

Almost surely, 2^199564811 is an apocalyptic number.

199564811 is a deficient number, since it is larger than the sum of its proper divisors (1).

199564811 is an equidigital number, since it uses as much as digits as its factorization.

199564811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 44.

The square root of 199564811 is about 14126.7409900515. The cubic root of 199564811 is about 584.3790728304.

The spelling of 199564811 in words is "one hundred ninety-nine million, five hundred sixty-four thousand, eight hundred eleven".