199994881 has 2 divisors, whose sum is σ = 199994882. Its totient is φ = 199994880.

The previous prime is 199994863. The next prime is 199994897. The reversal of 199994881 is 188499991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 141610000 + 58384881 = 11900^2 + 7641^2 .

It is a cyclic number.

It is not a de Polignac number, because 199994881 - 2⁹ = 199994369 is a prime.

It is a super-2 number, since 2×199994881² = 79995904852408322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (199994581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99997440 + 99997441.

It is an arithmetic number, because the mean of its divisors is an integer number (99997441).

Almost surely, 2^199994881 is an apocalyptic number.

It is an amenable number.

199994881 is a deficient number, since it is larger than the sum of its proper divisors (1).

199994881 is an equidigital number, since it uses as much as digits as its factorization.

199994881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1679616, while the sum is 58.

The square root of 199994881 is about 14141.9546385922. The cubic root of 199994881 is about 584.7985582511.

The spelling of 199994881 in words is "one hundred ninety-nine million, nine hundred ninety-four thousand, eight hundred eighty-one".