2581646 has 4 divisors (see below), whose sum is σ = 3872472. Its totient is φ = 1290822.

The previous prime is 2581643. The next prime is 2581651. The reversal of 2581646 is 6461852.

2581646 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 is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2581643) 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 as a sum of consecutive naturals, namely, 645410 + ... + 645413.

It is an arithmetic number, because the mean of its divisors is an integer number (968118).

2^2581646 is an apocalyptic number.

2581646 is a deficient number, since it is larger than the sum of its proper divisors (1290826).

2581646 is a wasteful number, since it uses less digits than its factorization.

2581646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1290825.

The product of its digits is 11520, while the sum is 32.

The square root of 2581646 is about 1606.7501361444. The cubic root of 2581646 is about 137.1825580538.

The spelling of 2581646 in words is "two million, five hundred eighty-one thousand, six hundred forty-six".