199998913 has 2 divisors, whose sum is σ = 199998914. Its totient is φ = 199998912.

The previous prime is 199998907. The next prime is 199998917. The reversal of 199998913 is 319899991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158936449 + 41062464 = 12607^2 + 6408^2 .

It is a cyclic number.

It is not a de Polignac number, because 199998913 - 2⁹ = 199998401 is a prime.

It is not a weakly prime, because it can be changed into another prime (199998917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99999456 + 99999457.

It is an arithmetic number, because the mean of its divisors is an integer number (99999457).

Almost surely, 2^199998913 is an apocalyptic number.

It is an amenable number.

199998913 is a deficient number, since it is larger than the sum of its proper divisors (1).

199998913 is an equidigital number, since it uses as much as digits as its factorization.

199998913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1417176, while the sum is 58.

The square root of 199998913 is about 14142.0971924252. The cubic root of 199998913 is about 584.8024881716.

It can be divided in two parts, 1999989 and 13, that added together give a palindrome (2000002).

The spelling of 199998913 in words is "one hundred ninety-nine million, nine hundred ninety-eight thousand, nine hundred thirteen".