2897776561 has 3 divisors (see below), whose sum is σ = 2897830393. Its totient is φ = 2897722730.

The previous prime is 2897776517. The next prime is 2897776571. The reversal of 2897776561 is 1656777982.

The square root of 2897776561 is 53831.

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

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 is not a de Polignac number, because 2897776561 - 2⁷ = 2897776433 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2897776496 and 2897776505.

It is not an unprimeable number, because it can be changed into a prime (2897776501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 26916 + ... + 80746.

Almost surely, 2^2897776561 is an apocalyptic number.

2897776561 is the 53831-st square number.

2897776561 is the 26916-th centered octagonal number.

It is an amenable number.

2897776561 is a deficient number, since it is larger than the sum of its proper divisors (53832).

2897776561 is an frugal number, since it uses more digits than its factorization.

2897776561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107662 (or 53831 counting only the distinct ones).

The product of its digits is 8890560, while the sum is 58.

The cubic root of 2897776561 is about 1425.6786033921.

The spelling of 2897776561 in words is "two billion, eight hundred ninety-seven million, seven hundred seventy-six thousand, five hundred sixty-one".