11920395891 has 8 divisors (see below), whose sum is σ = 15927897024. Its totient is φ = 7929912680.

The previous prime is 11920395889. The next prime is 11920395901. The reversal of 11920395891 is 19859302911.

11920395891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 11920395891 - 2¹ = 11920395889 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11920395891.

It is not an unprimeable number, because it can be changed into a prime (11920395871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4252845 + ... + 4255646.

It is an arithmetic number, because the mean of its divisors is an integer number (1990987128).

Almost surely, 2^11920395891 is an apocalyptic number.

11920395891 is a deficient number, since it is larger than the sum of its proper divisors (4007501133).

11920395891 is an equidigital number, since it uses as much as digits as its factorization.

11920395891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8508961.

The product of its (nonzero) digits is 174960, while the sum is 48.

The spelling of 11920395891 in words is "eleven billion, nine hundred twenty million, three hundred ninety-five thousand, eight hundred ninety-one".