199461861 has 6 divisors (see below), whose sum is σ = 288111590. Its totient is φ = 132974568.

The previous prime is 199461859. The next prime is 199461923. The reversal of 199461861 is 168164991.

It can be written as a sum of positive squares in only one way, i.e., 179828100 + 19633761 = 13410^2 + 4431^2 .

It is not a de Polignac number, because 199461861 - 2¹ = 199461859 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199461841) 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 5 ways as a sum of consecutive naturals, for example, 11081206 + ... + 11081223.

Almost surely, 2^199461861 is an apocalyptic number.

It is an amenable number.

199461861 is a deficient number, since it is larger than the sum of its proper divisors (88649729).

199461861 is a wasteful number, since it uses less digits than its factorization.

199461861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22162435 (or 22162432 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 199461861 is about 14123.0967213285. The cubic root of 199461861 is about 584.2785671793.

The spelling of 199461861 in words is "one hundred ninety-nine million, four hundred sixty-one thousand, eight hundred sixty-one".