444191813 has 16 divisors (see below), whose sum is σ = 490604016. Its totient is φ = 399651840.

The previous prime is 444191773. The next prime is 444191831. The reversal of 444191813 is 318191444.

It can be written as a sum of positive squares in 8 ways, for example, as 154579489 + 289612324 = 12433^2 + 17018^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-444191813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (444191873) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87131 + ... + 92087.

It is an arithmetic number, because the mean of its divisors is an integer number (30662751).

Almost surely, 2^444191813 is an apocalyptic number.

It is an amenable number.

444191813 is a deficient number, since it is larger than the sum of its proper divisors (46412203).

444191813 is a wasteful number, since it uses less digits than its factorization.

444191813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5144.

The product of its digits is 13824, while the sum is 35.

The square root of 444191813 is about 21075.8585353005. The cubic root of 444191813 is about 762.9982055569.

The spelling of 444191813 in words is "four hundred forty-four million, one hundred ninety-one thousand, eight hundred thirteen".