8356561 has 8 divisors (see below), whose sum is σ = 9034880. Its totient is φ = 7702128.

The previous prime is 8356559. The next prime is 8356591. The reversal of 8356561 is 1656538.

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

It is a cyclic number.

It is not a de Polignac number, because 8356561 - 2¹ = 8356559 is a prime.

It is a super-2 number, since 2×8356561² = 139664223493442, which contains 22 as substring.

8356561 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (8356511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5241 + ... + 6646.

It is an arithmetic number, because the mean of its divisors is an integer number (1129360).

Almost surely, 2^8356561 is an apocalyptic number.

It is an amenable number.

8356561 is a deficient number, since it is larger than the sum of its proper divisors (678319).

8356561 is a wasteful number, since it uses less digits than its factorization.

8356561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11943.

The product of its digits is 21600, while the sum is 34.

The square root of 8356561 is about 2890.7716962777. The cubic root of 8356561 is about 202.9282589239.

It can be divided in two parts, 835 and 6561, that added together give a square (7396 = 86²).

The spelling of 8356561 in words is "eight million, three hundred fifty-six thousand, five hundred sixty-one".