2521641 has 4 divisors (see below), whose sum is σ = 3362192. Its totient is φ = 1681092.

The previous prime is 2521621. The next prime is 2521643. The reversal of 2521641 is 1461252.

2521641 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 not a de Polignac number, because 2521641 - 2⁵ = 2521609 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2521643) 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, 420271 + ... + 420276.

It is an arithmetic number, because the mean of its divisors is an integer number (840548).

2^2521641 is an apocalyptic number.

It is an amenable number.

2521641 is a deficient number, since it is larger than the sum of its proper divisors (840551).

2521641 is an equidigital number, since it uses as much as digits as its factorization.

2521641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840550.

The product of its digits is 480, while the sum is 21.

The square root of 2521641 is about 1587.9675689384. The cubic root of 2521641 is about 136.1113743096. Note that the first 3 decimals are identical.

Adding to 2521641 its reverse (1461252), we get a palindrome (3982893).

The spelling of 2521641 in words is "two million, five hundred twenty-one thousand, six hundred forty-one".