8196561 has 12 divisors (see below), whose sum is σ = 11864320. Its totient is φ = 5452920.

The previous prime is 8196557. The next prime is 8196563. The reversal of 8196561 is 1656918.

8196561 is a `hidden beast` number, since 8 + 1 + 96 + 561 = 666.

It is not a de Polignac number, because 8196561 - 2² = 8196557 is a prime.

It is a super-2 number, since 2×8196561² = 134367224453442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8196563) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7776 + ... + 8766.

Almost surely, 2^8196561 is an apocalyptic number.

It is an amenable number.

8196561 is a deficient number, since it is larger than the sum of its proper divisors (3667759).

8196561 is a wasteful number, since it uses less digits than its factorization.

8196561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1916 (or 1913 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 8196561 is about 2862.9636742369. The cubic root of 8196561 is about 201.6247731509.

The spelling of 8196561 in words is "eight million, one hundred ninety-six thousand, five hundred sixty-one".