2044004004391 has 4 divisors (see below), whose sum is σ = 2045147824872. Its totient is φ = 2042860183912.

The previous prime is 2044004004389. The next prime is 2044004004433. The reversal of 2044004004391 is 1934004004402.

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 2044004004391 - 2¹ = 2044004004389 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 (2044004005391) 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, 571907560 + ... + 571911133.

It is an arithmetic number, because the mean of its divisors is an integer number (511286956218).

Almost surely, 2^{2044004004391} is an apocalyptic number.

2044004004391 is a deficient number, since it is larger than the sum of its proper divisors (1143820481).

2044004004391 is a wasteful number, since it uses less digits than its factorization.

2044004004391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1143820480.

The product of its (nonzero) digits is 13824, while the sum is 31.

Adding to 2044004004391 its reverse (1934004004402), we get a palindrome (3978008008793).

The spelling of 2044004004391 in words is "two trillion, forty-four billion, four million, four thousand, three hundred ninety-one".