4431661 has 4 divisors (see below), whose sum is σ = 4772572. Its totient is φ = 4090752.

The previous prime is 4431659. The next prime is 4431671. The reversal of 4431661 is 1661344.

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 1932100 + 2499561 = 1390^2 + 1581^2 .

It is a cyclic number.

It is not a de Polignac number, because 4431661 - 2¹ = 4431659 is a prime.

It is a super-4 number, since 4×4431661⁴ (a number of 28 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4431641) 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, 170436 + ... + 170461.

It is an arithmetic number, because the mean of its divisors is an integer number (1193143).

Almost surely, 2^4431661 is an apocalyptic number.

It is an amenable number.

4431661 is a deficient number, since it is larger than the sum of its proper divisors (340911).

4431661 is a wasteful number, since it uses less digits than its factorization.

4431661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340910.

The product of its digits is 1728, while the sum is 25.

The square root of 4431661 is about 2105.1510634631. The cubic root of 4431661 is about 164.2563534892.

The spelling of 4431661 in words is "four million, four hundred thirty-one thousand, six hundred sixty-one".