2581312 has 28 divisors (see below), whose sum is σ = 5225796. Its totient is φ = 1264640.

The previous prime is 2581289. The next prime is 2581349. The reversal of 2581312 is 2131852.

It can be written as a sum of positive squares in 2 ways, for example, as 665856 + 1915456 = 816^2 + 1384^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3012 + ... + 3772.

2^2581312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2581312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2612898).

2581312 is an abundant number, since it is smaller than the sum of its proper divisors (2644484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2581312 is an equidigital number, since it uses as much as digits as its factorization.

2581312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 826 (or 816 counting only the distinct ones).

The product of its digits is 480, while the sum is 22.

The square root of 2581312 is about 1606.6461962735. The cubic root of 2581312 is about 137.1766418089.

The spelling of 2581312 in words is "two million, five hundred eighty-one thousand, three hundred twelve".