2604521 has 2 divisors, whose sum is σ = 2604522. Its totient is φ = 2604520.

The previous prime is 2604509. The next prime is 2604523. The reversal of 2604521 is 1254062.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2560000 + 44521 = 1600^2 + 211^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2604521 is a prime.

Together with 2604523, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 2604493 and 2604502.

It is not a weakly prime, because it can be changed into another prime (2604523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1302260 + 1302261.

It is an arithmetic number, because the mean of its divisors is an integer number (1302261).

2^2604521 is an apocalyptic number.

It is an amenable number.

2604521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2604521 is an equidigital number, since it uses as much as digits as its factorization.

2604521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 2604521 is about 1613.8528433534. The cubic root of 2604521 is about 137.5865416630.

Adding to 2604521 its reverse (1254062), we get a palindrome (3858583).

It can be divided in two parts, 2604 and 521, that added together give a 5-th power (3125 = 5⁵).

The spelling of 2604521 in words is "two million, six hundred four thousand, five hundred twenty-one".