10508209 has 4 divisors (see below), whose sum is σ = 10601316. Its totient is φ = 10415104.

The previous prime is 10508207. The next prime is 10508221. The reversal of 10508209 is 90280501.

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 107584 + 10400625 = 328^2 + 3225^2 .

It is a cyclic number.

It is not a de Polignac number, because 10508209 - 2¹ = 10508207 is a prime.

It is a super-2 number, since 2×10508209² = 220844912775362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10508203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46384 + ... + 46609.

It is an arithmetic number, because the mean of its divisors is an integer number (2650329).

Almost surely, 2^10508209 is an apocalyptic number.

It is an amenable number.

10508209 is a deficient number, since it is larger than the sum of its proper divisors (93107).

10508209 is an equidigital number, since it uses as much as digits as its factorization.

10508209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93106.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 10508209 is about 3241.6367779256. The cubic root of 10508209 is about 219.0330079589.

The spelling of 10508209 in words is "ten million, five hundred eight thousand, two hundred nine".