1916791109 has 4 divisors (see below), whose sum is σ = 1922130720. Its totient is φ = 1911451500.

The previous prime is 1916791099. The next prime is 1916791111. The reversal of 1916791109 is 9011976191.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1916791109 - 2²⁴ = 1900013893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1916791109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1916791139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2669267 + ... + 2669984.

It is an arithmetic number, because the mean of its divisors is an integer number (480532680).

Almost surely, 2^1916791109 is an apocalyptic number.

It is an amenable number.

1916791109 is a deficient number, since it is larger than the sum of its proper divisors (5339611).

1916791109 is an equidigital number, since it uses as much as digits as its factorization.

1916791109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5339610.

The product of its (nonzero) digits is 30618, while the sum is 44.

The square root of 1916791109 is about 43781.1729970772. The cubic root of 1916791109 is about 1242.2002016667.

The spelling of 1916791109 in words is "one billion, nine hundred sixteen million, seven hundred ninety-one thousand, one hundred nine".