2642581 has 4 divisors (see below), whose sum is σ = 2685964. Its totient is φ = 2599200.

The previous prime is 2642569. The next prime is 2642587. The reversal of 2642581 is 1852462.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1102500 + 1540081 = 1050^2 + 1241^2 .

It is a cyclic number.

It is not a de Polignac number, because 2642581 - 2¹⁵ = 2609813 is a prime.

It is a super-2 number, since 2×2642581² = 13966468683122, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2642587) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21600 + ... + 21721.

It is an arithmetic number, because the mean of its divisors is an integer number (671491).

2^2642581 is an apocalyptic number.

It is an amenable number.

2642581 is a deficient number, since it is larger than the sum of its proper divisors (43383).

2642581 is an equidigital number, since it uses as much as digits as its factorization.

2642581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43382.

The product of its digits is 3840, while the sum is 28.

The square root of 2642581 is about 1625.6017347432. The cubic root of 2642581 is about 138.2534898354.

It can be divided in two parts, 2642 and 581, that added together give a palindrome (3223).

The spelling of 2642581 in words is "two million, six hundred forty-two thousand, five hundred eighty-one".