10856609 has 4 divisors (see below), whose sum is σ = 10882116. Its totient is φ = 10831104.

The previous prime is 10856579. The next prime is 10856627. The reversal of 10856609 is 90665801.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2608225 + 8248384 = 1615^2 + 2872^2 .

It is a cyclic number.

It is not a de Polignac number, because 10856609 - 2²⁰ = 9808033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10856639) 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, 12104 + ... + 12969.

It is an arithmetic number, because the mean of its divisors is an integer number (2720529).

Almost surely, 2^10856609 is an apocalyptic number.

It is an amenable number.

10856609 is a deficient number, since it is larger than the sum of its proper divisors (25507).

10856609 is an equidigital number, since it uses as much as digits as its factorization.

10856609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25506.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 10856609 is about 3294.9368734469. The cubic root of 10856609 is about 221.4274195867.

The spelling of 10856609 in words is "ten million, eight hundred fifty-six thousand, six hundred nine".