10509409 has 4 divisors (see below), whose sum is σ = 10521904. Its totient is φ = 10496916.

The previous prime is 10509371. The next prime is 10509461. The reversal of 10509409 is 90490501.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10509409 is a prime.

It is a super-2 number, since 2×10509409² = 220895355058562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10509469) 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, 4887 + ... + 6700.

It is an arithmetic number, because the mean of its divisors is an integer number (2630476).

Almost surely, 2^10509409 is an apocalyptic number.

It is an amenable number.

10509409 is a deficient number, since it is larger than the sum of its proper divisors (12495).

10509409 is an equidigital number, since it uses as much as digits as its factorization.

10509409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12494.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 10509409 is about 3241.8218643226. The cubic root of 10509409 is about 219.0413452377.

The spelling of 10509409 in words is "ten million, five hundred nine thousand, four hundred nine".