2661617 has 4 divisors (see below), whose sum is σ = 3041856. Its totient is φ = 2281380.

The previous prime is 2661611. The next prime is 2661641. The reversal of 2661617 is 7161662.

2661617 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7161662 = 2 ⋅3580831.

It is a cyclic number.

It is not a de Polignac number, because 2661617 - 2⁶ = 2661553 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2661617.

It is not an unprimeable number, because it can be changed into a prime (2661611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190109 + ... + 190122.

It is an arithmetic number, because the mean of its divisors is an integer number (760464).

2^2661617 is an apocalyptic number.

It is an amenable number.

2661617 is a deficient number, since it is larger than the sum of its proper divisors (380239).

2661617 is an equidigital number, since it uses as much as digits as its factorization.

2661617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380238.

The product of its digits is 3024, while the sum is 29.

The square root of 2661617 is about 1631.4462908720. The cubic root of 2661617 is about 138.5846684787.

The spelling of 2661617 in words is "two million, six hundred sixty-one thousand, six hundred seventeen".