199788081 has 8 divisors (see below), whose sum is σ = 266469984. Its totient is φ = 133149120.

The previous prime is 199788053. The next prime is 199788103. The reversal of 199788081 is 180887991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 199788081 - 2¹¹ = 199786033 is a prime.

It is a super-2 number, since 2×199788081² = 79830554619325122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (199788011) 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 in 7 ways as a sum of consecutive naturals, for example, 2430 + ... + 20136.

It is an arithmetic number, because the mean of its divisors is an integer number (33308748).

Almost surely, 2^199788081 is an apocalyptic number.

It is an amenable number.

199788081 is a deficient number, since it is larger than the sum of its proper divisors (66681903).

199788081 is a wasteful number, since it uses less digits than its factorization.

199788081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21471.

The product of its (nonzero) digits is 290304, while the sum is 51.

The square root of 199788081 is about 14134.6411698352. The cubic root of 199788081 is about 584.5969230075.

It can be divided in two parts, 19 and 9788081, that added together give a triangular number (9788100 = T₄₄₂₄).

The spelling of 199788081 in words is "one hundred ninety-nine million, seven hundred eighty-eight thousand, eighty-one".