2781144269 has 8 divisors (see below), whose sum is σ = 2828333112. Its totient is φ = 2734007040.

The previous prime is 2781144263. The next prime is 2781144271. The reversal of 2781144269 is 9624411872.

2781144269 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 677821225 + 2103323044 = 26035^2 + 45862^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2781144269 is a prime.

It is a super-2 number, since 2×2781144269² = 15469526889983088722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2781144263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104777 + ... + 128609.

It is an arithmetic number, because the mean of its divisors is an integer number (353541639).

Almost surely, 2^2781144269 is an apocalyptic number.

It is an amenable number.

2781144269 is a deficient number, since it is larger than the sum of its proper divisors (47188843).

2781144269 is a wasteful number, since it uses less digits than its factorization.

2781144269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25807.

The product of its digits is 193536, while the sum is 44.

The square root of 2781144269 is about 52736.5553387781. Note that the first 3 decimals coincide. The cubic root of 2781144269 is about 1406.2887613112.

The spelling of 2781144269 in words is "two billion, seven hundred eighty-one million, one hundred forty-four thousand, two hundred sixty-nine".