2521555 has 4 divisors (see below), whose sum is σ = 3025872. Its totient is φ = 2017240.

The previous prime is 2521537. The next prime is 2521591. The reversal of 2521555 is 5551252.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2521555 - 2¹³ = 2513363 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 252151 + ... + 252160.

It is an arithmetic number, because the mean of its divisors is an integer number (756468).

2^2521555 is an apocalyptic number.

2521555 is a deficient number, since it is larger than the sum of its proper divisors (504317).

2521555 is an equidigital number, since it uses as much as digits as its factorization.

2521555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 504316.

The product of its digits is 2500, while the sum is 25.

The square root of 2521555 is about 1587.9404900688. The cubic root of 2521555 is about 136.1098269427.

The spelling of 2521555 in words is "two million, five hundred twenty-one thousand, five hundred fifty-five".