199999881 has 32 divisors (see below), whose sum is σ = 310302720. Its totient is φ = 127073232.

The previous prime is 199999853. The next prime is 199999889. The reversal of 199999881 is 188999991.

It is not a de Polignac number, because 199999881 - 2¹⁵ = 199967113 is a prime.

It is a super-2 number, since 2×199999881² = 79999904800028322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (199999889) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 274740 + ... + 275466.

It is an arithmetic number, because the mean of its divisors is an integer number (9696960).

Almost surely, 2^199999881 is an apocalyptic number.

It is an amenable number.

199999881 is a deficient number, since it is larger than the sum of its proper divisors (110302839).

199999881 is a wasteful number, since it uses less digits than its factorization.

199999881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1202 (or 1196 counting only the distinct ones).

The product of its digits is 3779136, while the sum is 63.

The square root of 199999881 is about 14142.1314164450. The cubic root of 199999881 is about 584.8034316565.

The spelling of 199999881 in words is "one hundred ninety-nine million, nine hundred ninety-nine thousand, eight hundred eighty-one".