11191894539 has 24 divisors (see below), whose sum is σ = 18272485440. Its totient is φ = 6058768464.

The previous prime is 11191894523. The next prime is 11191894547. The reversal of 11191894539 is 93549819111.

It is not a de Polignac number, because 11191894539 - 2⁴ = 11191894523 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11191894491 and 11191894500.

It is not an unprimeable number, because it can be changed into a prime (11191894559) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2000769 + ... + 2006354.

It is an arithmetic number, because the mean of its divisors is an integer number (761353560).

Almost surely, 2^11191894539 is an apocalyptic number.

11191894539 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

11191894539 is a deficient number, since it is larger than the sum of its proper divisors (7080590901).

11191894539 is a wasteful number, since it uses less digits than its factorization.

11191894539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4007159 (or 4007152 counting only the distinct ones).

The product of its digits is 349920, while the sum is 51.

The spelling of 11191894539 in words is "eleven billion, one hundred ninety-one million, eight hundred ninety-four thousand, five hundred thirty-nine".