2581504 has 22 divisors (see below), whose sum is σ = 5162534. Its totient is φ = 1290240.

The previous prime is 2581487. The next prime is 2581507. The reversal of 2581504 is 4051852.

It can be written as a sum of positive squares in only one way, i.e., 1327104 + 1254400 = 1152^2 + 1120^2 .

It is not an unprimeable number, because it can be changed into a prime (2581507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 237 + ... + 2284.

2^2581504 is an apocalyptic number.

It is an amenable number.

2581504 is a deficient number, since it is larger than the sum of its proper divisors (2581030).

2581504 is an equidigital number, since it uses as much as digits as its factorization.

2581504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2541 (or 2523 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 2581504 is about 1606.7059469610. The cubic root of 2581504 is about 137.1800428264.

The spelling of 2581504 in words is "two million, five hundred eighty-one thousand, five hundred four".