199951061 has 4 divisors (see below), whose sum is σ = 199980300. Its totient is φ = 199921824.

The previous prime is 199951039. The next prime is 199951069. The reversal of 199951061 is 160159991.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 160159991 = 2957 ⋅54163.

It can be written as a sum of positive squares in 2 ways, for example, as 72148036 + 127803025 = 8494^2 + 11305^2 .

It is a cyclic number.

It is not a de Polignac number, because 199951061 - 2¹⁴ = 199934677 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199951069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1745 + ... + 20073.

It is an arithmetic number, because the mean of its divisors is an integer number (49995075).

Almost surely, 2^199951061 is an apocalyptic number.

It is an amenable number.

199951061 is a deficient number, since it is larger than the sum of its proper divisors (29239).

199951061 is a wasteful number, since it uses less digits than its factorization.

199951061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29238.

The product of its (nonzero) digits is 21870, while the sum is 41.

The square root of 199951061 is about 14140.4052629336. The cubic root of 199951061 is about 584.7558442501.

The spelling of 199951061 in words is "one hundred ninety-nine million, nine hundred fifty-one thousand, sixty-one".