919899913 has 2 divisors, whose sum is σ = 919899914. Its totient is φ = 919899912.

The previous prime is 919899899. The next prime is 919899917. The reversal of 919899913 is 319998919.

919899913 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 621405184 + 298494729 = 24928^2 + 17277^2 .

It is an emirp because it is prime and its reverse (319998919) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-919899913 is a prime.

It is not a weakly prime, because it can be changed into another prime (919899917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459949956 + 459949957.

It is an arithmetic number, because the mean of its divisors is an integer number (459949957).

Almost surely, 2^919899913 is an apocalyptic number.

It is an amenable number.

919899913 is a deficient number, since it is larger than the sum of its proper divisors (1).

919899913 is an equidigital number, since it uses as much as digits as its factorization.

919899913 is an odious number, because the sum of its binary digits is odd.

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

The square root of 919899913 is about 30329.8518459949. The cubic root of 919899913 is about 972.5535555565.

The spelling of 919899913 in words is "nine hundred nineteen million, eight hundred ninety-nine thousand, nine hundred thirteen".