10500209 has 4 divisors (see below), whose sum is σ = 10506816. Its totient is φ = 10493604.

The previous prime is 10500187. The next prime is 10500229. The reversal of 10500209 is 90200501.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 10500209 - 2²⁰ = 9451633 is a prime.

It is a super-2 number, since 2×10500209² = 220508778087362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10500229) 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, 692 + ... + 4634.

It is an arithmetic number, because the mean of its divisors is an integer number (2626704).

Almost surely, 2^10500209 is an apocalyptic number.

It is an amenable number.

10500209 is a deficient number, since it is larger than the sum of its proper divisors (6607).

10500209 is an equidigital number, since it uses as much as digits as its factorization.

10500209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6606.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 10500209 is about 3240.4025984436. The cubic root of 10500209 is about 218.9774098729.

The spelling of 10500209 in words is "ten million, five hundred thousand, two hundred nine".