54442379891 has 4 divisors (see below), whose sum is σ = 55334877984. Its totient is φ = 53549881800.

The previous prime is 54442379857. The next prime is 54442379917. The reversal of 54442379891 is 19897324445.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54442379891 is a prime.

It is a super-2 number, since 2×54442379891² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (54442379291) 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 3 ways as a sum of consecutive naturals, for example, 446248955 + ... + 446249076.

It is an arithmetic number, because the mean of its divisors is an integer number (13833719496).

Almost surely, 2^54442379891 is an apocalyptic number.

54442379891 is a deficient number, since it is larger than the sum of its proper divisors (892498093).

54442379891 is an equidigital number, since it uses as much as digits as its factorization.

54442379891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 892498092.

The product of its digits is 8709120, while the sum is 56.

The spelling of 54442379891 in words is "fifty-four billion, four hundred forty-two million, three hundred seventy-nine thousand, eight hundred ninety-one".