8872561 has 4 divisors (see below), whose sum is σ = 8879332. Its totient is φ = 8865792.

The previous prime is 8872559. The next prime is 8872573. The reversal of 8872561 is 1652788.

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 2 ways, for example, as 3783025 + 5089536 = 1945^2 + 2256^2 .

It is a cyclic number.

It is not a de Polignac number, because 8872561 - 2¹ = 8872559 is a prime.

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 8872561.

It is not an unprimeable number, because it can be changed into a prime (8872261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 720 + ... + 4273.

It is an arithmetic number, because the mean of its divisors is an integer number (2219833).

Almost surely, 2^8872561 is an apocalyptic number.

It is an amenable number.

8872561 is a deficient number, since it is larger than the sum of its proper divisors (6771).

8872561 is a wasteful number, since it uses less digits than its factorization.

8872561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6770.

The product of its digits is 26880, while the sum is 37.

The square root of 8872561 is about 2978.6844411585. The cubic root of 8872561 is about 207.0219196218.

The spelling of 8872561 in words is "eight million, eight hundred seventy-two thousand, five hundred sixty-one".