10217809 has 8 divisors (see below), whose sum is σ = 11993408. Its totient is φ = 8521200.

The previous prime is 10217803. The next prime is 10217821. The reversal of 10217809 is 90871201.

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 10217809 - 2⁵ = 10217777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (10217803) 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, 19467 + ... + 19984.

It is an arithmetic number, because the mean of its divisors is an integer number (1499176).

Almost surely, 2^10217809 is an apocalyptic number.

It is an amenable number.

10217809 is a deficient number, since it is larger than the sum of its proper divisors (1775599).

10217809 is an equidigital number, since it uses as much as digits as its factorization.

10217809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39495.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 10217809 is about 3196.5307757004. The cubic root of 10217809 is about 216.9964322291.

It can be divided in two parts, 10217 and 809, that added together give a triangular number (11026 = T₁₄₈).

The spelling of 10217809 in words is "ten million, two hundred seventeen thousand, eight hundred nine".