2609581 has 8 divisors (see below), whose sum is σ = 2870784. Its totient is φ = 2357040.

The previous prime is 2609539. The next prime is 2609587. The reversal of 2609581 is 1859062.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2609581 - 2⁹ = 2609069 is a prime.

It is a super-2 number, since 2×2609581² = 13619825991122, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2609587) 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 7 ways as a sum of consecutive naturals, for example, 1525 + ... + 2746.

It is an arithmetic number, because the mean of its divisors is an integer number (358848).

It is a Poulet number, since it divides 2^2609580-1.

2^2609581 is an apocalyptic number.

It is an amenable number.

2609581 is a deficient number, since it is larger than the sum of its proper divisors (261203).

2609581 is a wasteful number, since it uses less digits than its factorization.

2609581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4331.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 2609581 is about 1615.4197596910. The cubic root of 2609581 is about 137.6755839528.

The spelling of 2609581 in words is "two million, six hundred nine thousand, five hundred eighty-one".