1919113321 has 4 divisors (see below), whose sum is σ = 1919203200. Its totient is φ = 1919023444.

The previous prime is 1919113291. The next prime is 1919113331. The reversal of 1919113321 is 1233119191.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1233119191 = 17 ⋅72536423.

It is a cyclic number.

It is not a de Polignac number, because 1919113321 - 2⁹ = 1919112809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1919113331) 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, 7440 + ... + 62398.

It is an arithmetic number, because the mean of its divisors is an integer number (479800800).

Almost surely, 2^1919113321 is an apocalyptic number.

It is an amenable number.

1919113321 is a deficient number, since it is larger than the sum of its proper divisors (89879).

1919113321 is an equidigital number, since it uses as much as digits as its factorization.

1919113321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89878.

The product of its digits is 1458, while the sum is 31.

The square root of 1919113321 is about 43807.6856384813. The cubic root of 1919113321 is about 1242.7016452957.

The spelling of 1919113321 in words is "one billion, nine hundred nineteen million, one hundred thirteen thousand, three hundred twenty-one".