919900043 has 2 divisors, whose sum is σ = 919900044. Its totient is φ = 919900042.

The previous prime is 919900001. The next prime is 919900049. The reversal of 919900043 is 340009919.

It is a strong prime.

It is an emirp because it is prime and its reverse (340009919) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 919900043 - 2⁶ = 919899979 is a prime.

It is a super-2 number, since 2×919900043² = 1692432178222803698, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 919899976 and 919900012.

It is not a weakly prime, because it can be changed into another prime (919900049) 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, 459950021 + 459950022.

It is an arithmetic number, because the mean of its divisors is an integer number (459950022).

Almost surely, 2^919900043 is an apocalyptic number.

919900043 is a deficient number, since it is larger than the sum of its proper divisors (1).

919900043 is an equidigital number, since it uses as much as digits as its factorization.

919900043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 919900043 is about 30329.8539890979. The cubic root of 919900043 is about 972.5536013702.

The spelling of 919900043 in words is "nine hundred nineteen million, nine hundred thousand, forty-three".