5205509 has 4 divisors (see below), whose sum is σ = 5217216. Its totient is φ = 5193804.

The previous prime is 5205491. The next prime is 5205523. The reversal of 5205509 is 9055025.

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 not a de Polignac number, because 5205509 - 2⁸ = 5205253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5205539) 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, 5159 + ... + 6084.

It is an arithmetic number, because the mean of its divisors is an integer number (1304304).

Almost surely, 2^5205509 is an apocalyptic number.

It is an amenable number.

5205509 is a deficient number, since it is larger than the sum of its proper divisors (11707).

5205509 is a wasteful number, since it uses less digits than its factorization.

5205509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11706.

The product of its (nonzero) digits is 2250, while the sum is 26.

The square root of 5205509 is about 2281.5584585980. The cubic root of 5205509 is about 173.3089803886.

The spelling of 5205509 in words is "five million, two hundred five thousand, five hundred nine".