199846649 has 2 divisors, whose sum is σ = 199846650. Its totient is φ = 199846648.

The previous prime is 199846643. The next prime is 199846667. The reversal of 199846649 is 946648991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199713424 + 133225 = 14132^2 + 365^2 .

It is an emirp because it is prime and its reverse (946648991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199846649 - 2¹² = 199842553 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 199846594 and 199846603.

It is not a weakly prime, because it can be changed into another prime (199846643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99923324 + 99923325.

It is an arithmetic number, because the mean of its divisors is an integer number (99923325).

Almost surely, 2^199846649 is an apocalyptic number.

It is an amenable number.

199846649 is a deficient number, since it is larger than the sum of its proper divisors (1).

199846649 is an equidigital number, since it uses as much as digits as its factorization.

199846649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3359232, while the sum is 56.

The square root of 199846649 is about 14136.7128074387. The cubic root of 199846649 is about 584.6540424100.

The spelling of 199846649 in words is "one hundred ninety-nine million, eight hundred forty-six thousand, six hundred forty-nine".