199101881 has 4 divisors (see below), whose sum is σ = 217202064. Its totient is φ = 181001700.

The previous prime is 199101857. The next prime is 199101901. The reversal of 199101881 is 188101991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 199101881 - 2²² = 194907577 is a prime.

It is a super-2 number, since 2×199101881² = 79283118035476322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (199101281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9050075 + ... + 9050096.

It is an arithmetic number, because the mean of its divisors is an integer number (54300516).

Almost surely, 2^199101881 is an apocalyptic number.

199101881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

199101881 is a deficient number, since it is larger than the sum of its proper divisors (18100183).

199101881 is a wasteful number, since it uses less digits than its factorization.

199101881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18100182.

The product of its (nonzero) digits is 5184, while the sum is 38.

The square root of 199101881 is about 14110.3465939005. The cubic root of 199101881 is about 583.9268620878.

The spelling of 199101881 in words is "one hundred ninety-nine million, one hundred one thousand, eight hundred eighty-one".