919899979 has 2 divisors, whose sum is σ = 919899980. Its totient is φ = 919899978.

The previous prime is 919899977. The next prime is 919900001. The reversal of 919899979 is 979998919.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 919899979 - 2¹ = 919899977 is a prime.

Together with 919899977, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (919899977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459949989 + 459949990.

It is an arithmetic number, because the mean of its divisors is an integer number (459949990).

Almost surely, 2^919899979 is an apocalyptic number.

919899979 is a deficient number, since it is larger than the sum of its proper divisors (1).

919899979 is an equidigital number, since it uses as much as digits as its factorization.

919899979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29760696, while the sum is 70.

The square root of 919899979 is about 30329.8529340318. The cubic root of 919899979 is about 972.5535788158.

The spelling of 919899979 in words is "nine hundred nineteen million, eight hundred ninety-nine thousand, nine hundred seventy-nine".