199143605 has 6 divisors (see below), whose sum is σ = 239010198. Its totient is φ = 159289640.

The previous prime is 199143547. The next prime is 199143613. The reversal of 199143605 is 506341991.

It can be written as a sum of positive squares in only one way, i.e., 159314884 + 39828721 = 12622^2 + 6311^2 .

It is not a de Polignac number, because 199143605 - 2¹² = 199139509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 28400 + ... + 34710.

It is an arithmetic number, because the mean of its divisors is an integer number (39835033).

Almost surely, 2^199143605 is an apocalyptic number.

It is an amenable number.

199143605 is a deficient number, since it is larger than the sum of its proper divisors (39866593).

199143605 is an frugal number, since it uses more digits than its factorization.

199143605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12627 (or 6316 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 199143605 is about 14111.8250060012. The cubic root of 199143605 is about 583.9676486817.

The spelling of 199143605 in words is "one hundred ninety-nine million, one hundred forty-three thousand, six hundred five".