199846681 has 2 divisors, whose sum is σ = 199846682. Its totient is φ = 199846680.

The previous prime is 199846667. The next prime is 199846709. The reversal of 199846681 is 186648991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199261456 + 585225 = 14116^2 + 765^2 .

It is an emirp because it is prime and its reverse (186648991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199846681 - 2⁵ = 199846649 is a prime.

It is a super-2 number, since 2×199846681² = 79877391813431522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (199846631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99923340 + 99923341.

It is an arithmetic number, because the mean of its divisors is an integer number (99923341).

Almost surely, 2^199846681 is an apocalyptic number.

It is an amenable number.

199846681 is a deficient number, since it is larger than the sum of its proper divisors (1).

199846681 is an equidigital number, since it uses as much as digits as its factorization.

199846681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 746496, while the sum is 52.

The square root of 199846681 is about 14136.7139392434. The cubic root of 199846681 is about 584.6540736155.

The spelling of 199846681 in words is "one hundred ninety-nine million, eight hundred forty-six thousand, six hundred eighty-one".