441919891 has 4 divisors (see below), whose sum is σ = 505051312. Its totient is φ = 378788472.

The previous prime is 441919867. The next prime is 441919903. The reversal of 441919891 is 198919144.

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 441919891 - 2⁵ = 441919859 is a prime.

It is a super-2 number, since 2×441919891² = 390586380122903762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (441919801) 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, 31565700 + ... + 31565713.

It is an arithmetic number, because the mean of its divisors is an integer number (126262828).

Almost surely, 2^441919891 is an apocalyptic number.

441919891 is a deficient number, since it is larger than the sum of its proper divisors (63131421).

441919891 is an equidigital number, since it uses as much as digits as its factorization.

441919891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63131420.

The product of its digits is 93312, while the sum is 46.

The square root of 441919891 is about 21021.8907570180. The cubic root of 441919891 is about 761.6951376777.

It can be divided in two parts, 4419 and 19891, that added together give a triangular number (24310 = T₂₂₀).

The spelling of 441919891 in words is "four hundred forty-one million, nine hundred nineteen thousand, eight hundred ninety-one".