2613661 has 4 divisors (see below), whose sum is σ = 2621500. Its totient is φ = 2605824.

The previous prime is 2613649. The next prime is 2613671. The reversal of 2613661 is 1663162.

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 1625625 + 988036 = 1275^2 + 994^2 .

It is a cyclic number.

It is not a de Polignac number, because 2613661 - 2¹¹ = 2611613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2613601) 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, 3396 + ... + 4093.

It is an arithmetic number, because the mean of its divisors is an integer number (655375).

2^2613661 is an apocalyptic number.

It is an amenable number.

2613661 is a deficient number, since it is larger than the sum of its proper divisors (7839).

2613661 is an equidigital number, since it uses as much as digits as its factorization.

2613661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7838.

The product of its digits is 1296, while the sum is 25.

The square root of 2613661 is about 1616.6820961463. The cubic root of 2613661 is about 137.7472971122.

The spelling of 2613661 in words is "two million, six hundred thirteen thousand, six hundred sixty-one".