10502809 has 4 divisors (see below), whose sum is σ = 10532916. Its totient is φ = 10472704.

The previous prime is 10502803. The next prime is 10502827. The reversal of 10502809 is 90820501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90820501 = 271 ⋅335131.

It can be written as a sum of positive squares in 2 ways, for example, as 7952400 + 2550409 = 2820^2 + 1597^2 .

It is a cyclic number.

It is not a de Polignac number, because 10502809 - 2¹⁵ = 10470041 is a prime.

It is a super-2 number, since 2×10502809² = 220617993780962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10502803) 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, 14524 + ... + 15229.

It is an arithmetic number, because the mean of its divisors is an integer number (2633229).

Almost surely, 2^10502809 is an apocalyptic number.

It is an amenable number.

10502809 is a deficient number, since it is larger than the sum of its proper divisors (30107).

10502809 is an equidigital number, since it uses as much as digits as its factorization.

10502809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30106.

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

The square root of 10502809 is about 3240.8037583291. The cubic root of 10502809 is about 218.9954823474.

It can be divided in two parts, 10502 and 809, that added together give a palindrome (11311).

The spelling of 10502809 in words is "ten million, five hundred two thousand, eight hundred nine".