199800049 has 2 divisors, whose sum is σ = 199800050. Its totient is φ = 199800048.

The previous prime is 199800047. The next prime is 199800091. The reversal of 199800049 is 940008991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158583649 + 41216400 = 12593^2 + 6420^2 .

It is a cyclic number.

It is not a de Polignac number, because 199800049 - 2¹ = 199800047 is a prime.

It is a super-4 number, since 4×199800049⁴ (a number of 34 digits) contains 4444 as substring.

Together with 199800047, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 199799984 and 199800020.

It is not a weakly prime, because it can be changed into another prime (199800043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99900024 + 99900025.

It is an arithmetic number, because the mean of its divisors is an integer number (99900025).

Almost surely, 2^199800049 is an apocalyptic number.

It is an amenable number.

199800049 is a deficient number, since it is larger than the sum of its proper divisors (1).

199800049 is an equidigital number, since it uses as much as digits as its factorization.

199800049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 199800049 is about 14135.0645205461. The cubic root of 199800049 is about 584.6085959032.

The spelling of 199800049 in words is "one hundred ninety-nine million, eight hundred thousand, forty-nine".