2579661 has 16 divisors (see below), whose sum is σ = 4368000. Its totient is φ = 1473984.

The previous prime is 2579659. The next prime is 2579683. The reversal of 2579661 is 1669752.

It is not a de Polignac number, because 2579661 - 2¹ = 2579659 is a prime.

It is an Ulam number.

2579661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2579651) 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 15 ways as a sum of consecutive naturals, for example, 6636 + ... + 7013.

It is an arithmetic number, because the mean of its divisors is an integer number (273000).

2^2579661 is an apocalyptic number.

2579661 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2579661 is a deficient number, since it is larger than the sum of its proper divisors (1788339).

2579661 is a wasteful number, since it uses less digits than its factorization.

2579661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13665 (or 13659 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 2579661 is about 1606.1323108636. The cubic root of 2579661 is about 137.1473896381.

Subtracting from 2579661 its reverse (1669752), we obtain a palindrome (909909).

It can be divided in two parts, 2579 and 661, that added together give a triangular number (3240 = T₈₀).

The spelling of 2579661 in words is "two million, five hundred seventy-nine thousand, six hundred sixty-one".