199866461 has 2 divisors, whose sum is σ = 199866462. Its totient is φ = 199866460.

The previous prime is 199866449. The next prime is 199866473. The reversal of 199866461 is 164668991.

It is a balanced prime because it is at equal distance from previous prime (199866449) and next prime (199866473).

It can be written as a sum of positive squares in only one way, i.e., 111619225 + 88247236 = 10565^2 + 9394^2 .

It is a cyclic number.

It is not a de Polignac number, because 199866461 - 2⁶ = 199866397 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199866421) 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 as a sum of consecutive naturals, namely, 99933230 + 99933231.

It is an arithmetic number, because the mean of its divisors is an integer number (99933231).

Almost surely, 2^199866461 is an apocalyptic number.

It is an amenable number.

199866461 is a deficient number, since it is larger than the sum of its proper divisors (1).

199866461 is an equidigital number, since it uses as much as digits as its factorization.

199866461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 559872, while the sum is 50.

The square root of 199866461 is about 14137.4135187452. The cubic root of 199866461 is about 584.6733618619.

The spelling of 199866461 in words is "one hundred ninety-nine million, eight hundred sixty-six thousand, four hundred sixty-one".