199181047 has 16 divisors (see below), whose sum is σ = 226437120. Its totient is φ = 173685600.

The previous prime is 199181039. The next prime is 199181051. The reversal of 199181047 is 740181991.

It is a cyclic number.

It is not a de Polignac number, because 199181047 - 2³ = 199181039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199181447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105522 + ... + 107392.

It is an arithmetic number, because the mean of its divisors is an integer number (14152320).

Almost surely, 2^199181047 is an apocalyptic number.

199181047 is a deficient number, since it is larger than the sum of its proper divisors (27256073).

199181047 is a wasteful number, since it uses less digits than its factorization.

199181047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2334.

The product of its (nonzero) digits is 18144, while the sum is 40.

The square root of 199181047 is about 14113.1515615755. The cubic root of 199181047 is about 584.0042446289.

It can be divided in two parts, 1991 and 81047, that added together give a palindrome (83038).

The spelling of 199181047 in words is "one hundred ninety-nine million, one hundred eighty-one thousand, forty-seven".