2443661 has 4 divisors (see below), whose sum is σ = 2665824. Its totient is φ = 2221500.

The previous prime is 2443657. The next prime is 2443667. The reversal of 2443661 is 1663442.

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 2443661 - 2² = 2443657 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 2443661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2443667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111065 + ... + 111086.

It is an arithmetic number, because the mean of its divisors is an integer number (666456).

2^2443661 is an apocalyptic number.

It is an amenable number.

2443661 is a deficient number, since it is larger than the sum of its proper divisors (222163).

2443661 is a wasteful number, since it uses less digits than its factorization.

2443661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222162.

The product of its digits is 3456, while the sum is 26.

The square root of 2443661 is about 1563.2213534877. The cubic root of 2443661 is about 134.6936078449.

The spelling of 2443661 in words is "two million, four hundred forty-three thousand, six hundred sixty-one".