1919281819091 has 8 divisors (see below), whose sum is σ = 2362193008224. Its totient is φ = 1518552648000.

The previous prime is 1919281819031. The next prime is 1919281819139. The reversal of 1919281819091 is 1909181829191.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1919281819091 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1919281819091.

It is not an unprimeable number, because it can be changed into a prime (1919281819031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10545504410 + ... + 10545504591.

It is an arithmetic number, because the mean of its divisors is an integer number (295274126028).

Almost surely, 2^{1919281819091} is an apocalyptic number.

1919281819091 is a deficient number, since it is larger than the sum of its proper divisors (442911189133).

1919281819091 is a wasteful number, since it uses less digits than its factorization.

1919281819091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21091009021.

The product of its (nonzero) digits is 839808, while the sum is 59.

It can be divided in two parts, 1919281 and 819091, that added together give a palindrome (2738372).

The spelling of 1919281819091 in words is "one trillion, nine hundred nineteen billion, two hundred eighty-one million, eight hundred nineteen thousand, ninety-one".