2581641 has 12 divisors (see below), whose sum is σ = 3777280. Its totient is φ = 1698840.

The previous prime is 2581639. The next prime is 2581643. The reversal of 2581641 is 1461852.

It is an interprime number because it is at equal distance from previous prime (2581639) and next prime (2581643).

It is not a de Polignac number, because 2581641 - 2¹ = 2581639 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a zygodrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (2581643) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1105 + ... + 2526.

2^2581641 is an apocalyptic number.

It is an amenable number.

2581641 is a deficient number, since it is larger than the sum of its proper divisors (1195639).

2581641 is a wasteful number, since it uses less digits than its factorization.

2581641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3716 (or 3713 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 2581641 is about 1606.7485802079. The cubic root of 2581641 is about 137.1824694910.

The spelling of 2581641 in words is "two million, five hundred eighty-one thousand, six hundred forty-one".