2881649761 has 3 divisors (see below), whose sum is σ = 2881703443. Its totient is φ = 2881596080.

The previous prime is 2881649717. The next prime is 2881649789. The reversal of 2881649761 is 1679461882.

The square root of 2881649761 is 53681.

It is a perfect power (a square), and thus also a powerful number.

2881649761 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 1134409761 + 1747240000 = 33681^2 + 41800^2 .

It is not a de Polignac number, because 2881649761 - 2⁷ = 2881649633 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2881649699 and 2881649708.

It is not an unprimeable number, because it can be changed into a prime (2881649711) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 26841 + ... + 80521.

Almost surely, 2^2881649761 is an apocalyptic number.

2881649761 is the 53681-st square number.

2881649761 is the 26841-st centered octagonal number.

It is an amenable number.

2881649761 is a deficient number, since it is larger than the sum of its proper divisors (53682).

2881649761 is an frugal number, since it uses more digits than its factorization.

2881649761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107362 (or 53681 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 52.

The cubic root of 2881649761 is about 1423.0289377101.

The spelling of 2881649761 in words is "two billion, eight hundred eighty-one million, six hundred forty-nine thousand, seven hundred sixty-one".