199471989137 has 4 divisors (see below), whose sum is σ = 206350333620. Its totient is φ = 192593644656.

The previous prime is 199471989061. The next prime is 199471989139. The reversal of 199471989137 is 731989174991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 74577601921 + 124894387216 = 273089^2 + 353404^2 .

It is a cyclic number.

It is not a de Polignac number, because 199471989137 - 2¹⁴ = 199471972753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199471989139) 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, 3439172198 + ... + 3439172255.

It is an arithmetic number, because the mean of its divisors is an integer number (51587583405).

Almost surely, 2^199471989137 is an apocalyptic number.

It is an amenable number.

199471989137 is a deficient number, since it is larger than the sum of its proper divisors (6878344483).

199471989137 is an equidigital number, since it uses as much as digits as its factorization.

199471989137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6878344482.

The product of its digits is 30862944, while the sum is 68.

The spelling of 199471989137 in words is "one hundred ninety-nine billion, four hundred seventy-one million, nine hundred eighty-nine thousand, one hundred thirty-seven".