11931942559 has 4 divisors (see below), whose sum is σ = 12099998160. Its totient is φ = 11763886960.

The previous prime is 11931942509. The next prime is 11931942569. The reversal of 11931942559 is 95524913911.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11931942559 - 2¹³ = 11931934367 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11931942509) 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, 84027694 + ... + 84027835.

It is an arithmetic number, because the mean of its divisors is an integer number (3024999540).

Almost surely, 2^11931942559 is an apocalyptic number.

11931942559 is a deficient number, since it is larger than the sum of its proper divisors (168055601).

11931942559 is an equidigital number, since it uses as much as digits as its factorization.

11931942559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168055600.

The product of its digits is 437400, while the sum is 49.

The spelling of 11931942559 in words is "eleven billion, nine hundred thirty-one million, nine hundred forty-two thousand, five hundred fifty-nine".