2505509 has 4 divisors (see below), whose sum is σ = 2512704. Its totient is φ = 2498316.

The previous prime is 2505499. The next prime is 2505527. The reversal of 2505509 is 9055052.

2505509 is digitally balanced in base 2, 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 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 2505509 - 2⁸ = 2505253 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 (2505539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3047 + ... + 3780.

It is an arithmetic number, because the mean of its divisors is an integer number (628176).

2^2505509 is an apocalyptic number.

It is an amenable number.

2505509 is a deficient number, since it is larger than the sum of its proper divisors (7195).

2505509 is an equidigital number, since it uses as much as digits as its factorization.

2505509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7194.

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

The square root of 2505509 is about 1582.8799701809. The cubic root of 2505509 is about 135.8204992035.

The spelling of 2505509 in words is "two million, five hundred five thousand, five hundred nine".