1918991119 has 4 divisors (see below), whose sum is σ = 1919599840. Its totient is φ = 1918382400.

The previous prime is 1918991083. The next prime is 1918991147. The reversal of 1918991119 is 9111998191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9111998191 = 67 ⋅135999973.

It is a cyclic number.

It is not a de Polignac number, because 1918991119 - 2¹¹ = 1918989071 is a prime.

It is a super-2 number, since 2×1918991119² = 7365053829601744322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1918991149) 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 in 3 ways as a sum of consecutive naturals, for example, 299607 + ... + 305944.

It is an arithmetic number, because the mean of its divisors is an integer number (479899960).

Almost surely, 2^1918991119 is an apocalyptic number.

1918991119 is a deficient number, since it is larger than the sum of its proper divisors (608721).

1918991119 is an equidigital number, since it uses as much as digits as its factorization.

1918991119 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608720.

The product of its digits is 52488, while the sum is 49.

The square root of 1918991119 is about 43806.2908610168. The cubic root of 1918991119 is about 1242.6752678626.

The spelling of 1918991119 in words is "one billion, nine hundred eighteen million, nine hundred ninety-one thousand, one hundred nineteen".