2579861 has 4 divisors (see below), whose sum is σ = 2589324. Its totient is φ = 2570400.

The previous prime is 2579827. The next prime is 2579891. The reversal of 2579861 is 1689752.

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 1705636 + 874225 = 1306^2 + 935^2 .

It is a cyclic number.

It is not a de Polignac number, because 2579861 - 2¹⁰ = 2578837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2579821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4310 + ... + 4871.

It is an arithmetic number, because the mean of its divisors is an integer number (647331).

2^2579861 is an apocalyptic number.

It is an amenable number.

2579861 is a deficient number, since it is larger than the sum of its proper divisors (9463).

2579861 is an equidigital number, since it uses as much as digits as its factorization.

2579861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9462.

The product of its digits is 30240, while the sum is 38.

The square root of 2579861 is about 1606.1945710281. The cubic root of 2579861 is about 137.1509338725.

The spelling of 2579861 in words is "two million, five hundred seventy-nine thousand, eight hundred sixty-one".