4381661 has 4 divisors (see below), whose sum is σ = 4572192. Its totient is φ = 4191132.

The previous prime is 4381607. The next prime is 4381667. The reversal of 4381661 is 1661834.

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 4381661 - 2¹⁰ = 4380637 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 (4381667) 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, 95231 + ... + 95276.

It is an arithmetic number, because the mean of its divisors is an integer number (1143048).

Almost surely, 2^4381661 is an apocalyptic number.

It is an amenable number.

4381661 is a deficient number, since it is larger than the sum of its proper divisors (190531).

4381661 is a wasteful number, since it uses less digits than its factorization.

4381661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190530.

The product of its digits is 3456, while the sum is 29.

The square root of 4381661 is about 2093.2417442809. The cubic root of 4381661 is about 163.6362775065.

The spelling of 4381661 in words is "four million, three hundred eighty-one thousand, six hundred sixty-one".