2044560781 has 4 divisors (see below), whose sum is σ = 2133454752. Its totient is φ = 1955666812.

The previous prime is 2044560779. The next prime is 2044560809. The reversal of 2044560781 is 1870654402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1870654402 = 2 ⋅935327201.

It is a cyclic number.

It is not a de Polignac number, because 2044560781 - 2¹ = 2044560779 is a prime.

It is a super-2 number, since 2×2044560781² = 8360457574406659922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2044560781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2044560731) 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, 44446951 + ... + 44446996.

It is an arithmetic number, because the mean of its divisors is an integer number (533363688).

Almost surely, 2^2044560781 is an apocalyptic number.

It is an amenable number.

2044560781 is a deficient number, since it is larger than the sum of its proper divisors (88893971).

2044560781 is an equidigital number, since it uses as much as digits as its factorization.

2044560781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88893970.

The product of its (nonzero) digits is 53760, while the sum is 37.

The square root of 2044560781 is about 45216.8196692337. The cubic root of 2044560781 is about 1269.2095813239.

The spelling of 2044560781 in words is "two billion, forty-four million, five hundred sixty thousand, seven hundred eighty-one".