1919111816 has 8 divisors (see below), whose sum is σ = 3598334670. Its totient is φ = 959555904.

The previous prime is 1919111813. The next prime is 1919111833. The reversal of 1919111816 is 6181119191.

It can be written as a sum of positive squares in only one way, i.e., 1726734916 + 192376900 = 41554^2 + 13870^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 1919111816.

It is not an unprimeable number, because it can be changed into a prime (1919111813) by changing a digit.

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 as a sum of consecutive naturals, namely, 119944481 + ... + 119944496.

Almost surely, 2^1919111816 is an apocalyptic number.

It is an amenable number.

1919111816 is a deficient number, since it is larger than the sum of its proper divisors (1679222854).

1919111816 is a wasteful number, since it uses less digits than its factorization.

1919111816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239888983 (or 239888979 counting only the distinct ones).

The product of its digits is 3888, while the sum is 38.

The square root of 1919111816 is about 43807.6684611268. The cubic root of 1919111816 is about 1242.7013204467.

The spelling of 1919111816 in words is "one billion, nine hundred nineteen million, one hundred eleven thousand, eight hundred sixteen".