2504921 has 4 divisors (see below), whose sum is σ = 2512692. Its totient is φ = 2497152.

The previous prime is 2504917. The next prime is 2504923. The reversal of 2504921 is 1294052.

2504921 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.

It can be written as a sum of positive squares in 2 ways, for example, as 373321 + 2131600 = 611^2 + 1460^2 .

It is a cyclic number.

It is not a de Polignac number, because 2504921 - 2² = 2504917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2504923) 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, 3380 + ... + 4053.

It is an arithmetic number, because the mean of its divisors is an integer number (628173).

2^2504921 is an apocalyptic number.

It is an amenable number.

2504921 is a deficient number, since it is larger than the sum of its proper divisors (7771).

2504921 is an equidigital number, since it uses as much as digits as its factorization.

2504921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7770.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 2504921 is about 1582.6942218887. The cubic root of 2504921 is about 135.8098734582.

Adding to 2504921 its reverse (1294052), we get a palindrome (3798973).

The spelling of 2504921 in words is "two million, five hundred four thousand, nine hundred twenty-one".