199986461 has 2 divisors, whose sum is σ = 199986462. Its totient is φ = 199986460.

The previous prime is 199986439. The next prime is 199986529. The reversal of 199986461 is 164689991.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193043236 + 6943225 = 13894^2 + 2635^2 .

It is an emirp because it is prime and its reverse (164689991) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199986461 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199986431) 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, 99993230 + 99993231.

It is an arithmetic number, because the mean of its divisors is an integer number (99993231).

Almost surely, 2^199986461 is an apocalyptic number.

It is an amenable number.

199986461 is a deficient number, since it is larger than the sum of its proper divisors (1).

199986461 is an equidigital number, since it uses as much as digits as its factorization.

199986461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 839808, while the sum is 53.

The square root of 199986461 is about 14141.6569396942. The cubic root of 199986461 is about 584.7903512527.

The spelling of 199986461 in words is "one hundred ninety-nine million, nine hundred eighty-six thousand, four hundred sixty-one".