10500409 has 4 divisors (see below), whose sum is σ = 10508404. Its totient is φ = 10492416.

The previous prime is 10500379. The next prime is 10500421. The reversal of 10500409 is 90400501.

10500409 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 3504384 + 6996025 = 1872^2 + 2645^2 .

It is a cyclic number.

It is not a de Polignac number, because 10500409 - 2¹¹ = 10498361 is a prime.

It is a super-2 number, since 2×10500409² = 220517178334562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10500439) 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, 1512 + ... + 4825.

It is an arithmetic number, because the mean of its divisors is an integer number (2627101).

Almost surely, 2^10500409 is an apocalyptic number.

It is an amenable number.

10500409 is a deficient number, since it is larger than the sum of its proper divisors (7995).

10500409 is an equidigital number, since it uses as much as digits as its factorization.

10500409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7994.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 10500409 is about 3240.4334586595. The cubic root of 10500409 is about 218.9788001691.

The spelling of 10500409 in words is "ten million, five hundred thousand, four hundred nine".