4446157891 has 4 divisors (see below), whose sum is σ = 5081323312. Its totient is φ = 3810992472.

The previous prime is 4446157847. The next prime is 4446157897. The reversal of 4446157891 is 1987516444.

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

It is not a de Polignac number, because 4446157891 - 2¹³ = 4446149699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4446157897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 317582700 + ... + 317582713.

It is an arithmetic number, because the mean of its divisors is an integer number (1270330828).

Almost surely, 2^4446157891 is an apocalyptic number.

4446157891 is a deficient number, since it is larger than the sum of its proper divisors (635165421).

4446157891 is an equidigital number, since it uses as much as digits as its factorization.

4446157891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635165420.

The product of its digits is 967680, while the sum is 49.

The square root of 4446157891 is about 66679.5162774896. The cubic root of 4446157891 is about 1644.3526418699.

The spelling of 4446157891 in words is "four billion, four hundred forty-six million, one hundred fifty-seven thousand, eight hundred ninety-one".