2581006 has 4 divisors (see below), whose sum is σ = 3871512. Its totient is φ = 1290502.

The previous prime is 2581003. The next prime is 2581013. The reversal of 2581006 is 6001852.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2581003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645250 + ... + 645253.

It is an arithmetic number, because the mean of its divisors is an integer number (967878).

2^2581006 is an apocalyptic number.

2581006 is a deficient number, since it is larger than the sum of its proper divisors (1290506).

2581006 is a wasteful number, since it uses less digits than its factorization.

2581006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1290505.

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

The square root of 2581006 is about 1606.5509640220. The cubic root of 2581006 is about 137.1712210885.

Adding to 2581006 its reverse (6001852), we get a palindrome (8582858).

The spelling of 2581006 in words is "two million, five hundred eighty-one thousand, six".