2641661 has 4 divisors (see below), whose sum is σ = 2881824. Its totient is φ = 2401500.

The previous prime is 2641657. The next prime is 2641663. The reversal of 2641661 is 1661462.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 2641661 - 2² = 2641657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2641661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2641663) 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, 120065 + ... + 120086.

It is an arithmetic number, because the mean of its divisors is an integer number (720456).

2^2641661 is an apocalyptic number.

It is an amenable number.

2641661 is a deficient number, since it is larger than the sum of its proper divisors (240163).

2641661 is a wasteful number, since it uses less digits than its factorization.

2641661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240162.

The product of its digits is 1728, while the sum is 26.

The square root of 2641661 is about 1625.3187379711. The cubic root of 2641661 is about 138.2374439098.

The spelling of 2641661 in words is "two million, six hundred forty-one thousand, six hundred sixty-one".