444100991 has 4 divisors (see below), whose sum is σ = 450729432. Its totient is φ = 437472552.

The previous prime is 444100967. The next prime is 444101023. The reversal of 444100991 is 199001444.

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 444100991 - 2¹⁸ = 443838847 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 (444100291) 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, 3314120 + ... + 3314253.

It is an arithmetic number, because the mean of its divisors is an integer number (112682358).

Almost surely, 2^444100991 is an apocalyptic number.

444100991 is a deficient number, since it is larger than the sum of its proper divisors (6628441).

444100991 is an equidigital number, since it uses as much as digits as its factorization.

444100991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6628440.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 444100991 is about 21073.7037798295. The cubic root of 444100991 is about 762.9461996858.

The spelling of 444100991 in words is "four hundred forty-four million, one hundred thousand, nine hundred ninety-one".