10816561 has 8 divisors (see below), whose sum is σ = 12453120. Its totient is φ = 9202848.

The previous prime is 10816549. The next prime is 10816571. The reversal of 10816561 is 16561801.

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 10816561 - 2¹⁵ = 10783793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10816501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4681 + ... + 6598.

It is an arithmetic number, because the mean of its divisors is an integer number (1556640).

Almost surely, 2^10816561 is an apocalyptic number.

It is an amenable number.

10816561 is a deficient number, since it is larger than the sum of its proper divisors (1636559).

10816561 is a wasteful number, since it uses less digits than its factorization.

10816561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11423.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 10816561 is about 3288.8540557465. The cubic root of 10816561 is about 221.1548160051.

The spelling of 10816561 in words is "ten million, eight hundred sixteen thousand, five hundred sixty-one".