1913919005 has 4 divisors (see below), whose sum is σ = 2296702812. Its totient is φ = 1531135200.

The previous prime is 1913918971. The next prime is 1913919043. The reversal of 1913919005 is 5009193191.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 237098404 + 1676820601 = 15398^2 + 40949^2 .

It is not a de Polignac number, because 1913919005 - 2⁸ = 1913918749 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1913919005.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191391896 + ... + 191391905.

It is an arithmetic number, because the mean of its divisors is an integer number (574175703).

Almost surely, 2^1913919005 is an apocalyptic number.

It is an amenable number.

1913919005 is a deficient number, since it is larger than the sum of its proper divisors (382783807).

1913919005 is an equidigital number, since it uses as much as digits as its factorization.

1913919005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382783806.

The product of its (nonzero) digits is 10935, while the sum is 38.

The square root of 1913919005 is about 43748.3600264056. The cubic root of 1913919005 is about 1241.5794573425.

The spelling of 1913919005 in words is "one billion, nine hundred thirteen million, nine hundred nineteen thousand, five".