1919694889 has 4 divisors (see below), whose sum is σ = 2193937024. Its totient is φ = 1645452756.

The previous prime is 1919694853. The next prime is 1919694919. The reversal of 1919694889 is 9884969191.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9884969191 = 30071 ⋅328721.

It is a cyclic number.

It is not a de Polignac number, because 1919694889 - 2⁹ = 1919694377 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 1919694889.

It is not an unprimeable number, because it can be changed into a prime (1919694289) 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, 137121057 + ... + 137121070.

It is an arithmetic number, because the mean of its divisors is an integer number (548484256).

Almost surely, 2^1919694889 is an apocalyptic number.

It is an amenable number.

1919694889 is a deficient number, since it is larger than the sum of its proper divisors (274242135).

1919694889 is an equidigital number, since it uses as much as digits as its factorization.

1919694889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274242134.

The product of its digits is 10077696, while the sum is 64.

The square root of 1919694889 is about 43814.3228750599. The cubic root of 1919694889 is about 1242.8271620315.

The spelling of 1919694889 in words is "one billion, nine hundred nineteen million, six hundred ninety-four thousand, eight hundred eighty-nine".