2521509 has 16 divisors (see below), whose sum is σ = 3655680. Its totient is φ = 1540080.

The previous prime is 2521507. The next prime is 2521517. The reversal of 2521509 is 9051252.

It is not a de Polignac number, because 2521509 - 2¹ = 2521507 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2521501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1054 + ... + 2480.

It is an arithmetic number, because the mean of its divisors is an integer number (228480).

2^2521509 is an apocalyptic number.

It is an amenable number.

2521509 is a deficient number, since it is larger than the sum of its proper divisors (1134171).

2521509 is a wasteful number, since it uses less digits than its factorization.

2521509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1480.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 2521509 is about 1587.9260058328. The cubic root of 2521509 is about 136.1089992669.

The spelling of 2521509 in words is "two million, five hundred twenty-one thousand, five hundred nine".