4209661 has 8 divisors (see below), whose sum is σ = 4304448. Its totient is φ = 4116000.

The previous prime is 4209643. The next prime is 4209679. The reversal of 4209661 is 1669024.

It is an interprime number because it is at equal distance from previous prime (4209643) and next prime (4209679).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 3-Lehmer number, since φ(4209661) divides (4209661-1)³.

It is a cyclic number.

It is not a de Polignac number, because 4209661 - 2⁵ = 4209629 is a prime.

It is a deceptive number, since it divides R_4209660.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4200661) 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 7 ways as a sum of consecutive naturals, for example, 14841 + ... + 15121.

It is an arithmetic number, because the mean of its divisors is an integer number (538056).

It is a Poulet number, since it divides 2^4209660-1.

Almost surely, 2^4209661 is an apocalyptic number.

It is an amenable number.

4209661 is a deficient number, since it is larger than the sum of its proper divisors (94787).

4209661 is a wasteful number, since it uses less digits than its factorization.

4209661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 4209661 is about 2051.7458419600. The cubic root of 4209661 is about 161.4664788713.

Adding to 4209661 its product of nonzero digits (2592), we get a triangular number (4212253 = T₂₉₀₂).

The spelling of 4209661 in words is "four million, two hundred nine thousand, six hundred sixty-one".