10866521 has 2 divisors, whose sum is σ = 10866522. Its totient is φ = 10866520.

The previous prime is 10866509. The next prime is 10866533. The reversal of 10866521 is 12566801.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (10866509) and next prime (10866533).

It can be written as a sum of positive squares in only one way, i.e., 10010896 + 855625 = 3164^2 + 925^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10866521 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (10866221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5433260 + 5433261.

It is an arithmetic number, because the mean of its divisors is an integer number (5433261).

Almost surely, 2^10866521 is an apocalyptic number.

It is an amenable number.

10866521 is a deficient number, since it is larger than the sum of its proper divisors (1).

10866521 is an equidigital number, since it uses as much as digits as its factorization.

10866521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 10866521 is about 3296.4406562230. The cubic root of 10866521 is about 221.4947862626.

The spelling of 10866521 in words is "ten million, eight hundred sixty-six thousand, five hundred twenty-one".