11391121439 has 16 divisors (see below), whose sum is σ = 12814329600. Its totient is φ = 10071581184.

The previous prime is 11391121411. The next prime is 11391121463. The reversal of 11391121439 is 93412119311.

It is not a de Polignac number, because 11391121439 - 2¹² = 11391117343 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11391121399 and 11391121408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11391121139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 293999 + ... + 330480.

It is an arithmetic number, because the mean of its divisors is an integer number (800895600).

Almost surely, 2^11391121439 is an apocalyptic number.

11391121439 is a deficient number, since it is larger than the sum of its proper divisors (1423208161).

11391121439 is a wasteful number, since it uses less digits than its factorization.

11391121439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624562.

The product of its digits is 5832, while the sum is 35.

The spelling of 11391121439 in words is "eleven billion, three hundred ninety-one million, one hundred twenty-one thousand, four hundred thirty-nine".