8956561 has 4 divisors (see below), whose sum is σ = 8962624. Its totient is φ = 8950500.

The previous prime is 8956559. The next prime is 8956567. The reversal of 8956561 is 1656598.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 8956561 - 2¹ = 8956559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8956567) 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, 796 + ... + 4306.

It is an arithmetic number, because the mean of its divisors is an integer number (2240656).

Almost surely, 2^8956561 is an apocalyptic number.

It is an amenable number.

8956561 is a deficient number, since it is larger than the sum of its proper divisors (6063).

8956561 is a wasteful number, since it uses less digits than its factorization.

8956561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6062.

The product of its digits is 64800, while the sum is 40.

The square root of 8956561 is about 2992.7514096563. The cubic root of 8956561 is about 207.6731877760.

The spelling of 8956561 in words is "eight million, nine hundred fifty-six thousand, five hundred sixty-one".