4135661 has 4 divisors (see below), whose sum is σ = 4278300. Its totient is φ = 3993024.

The previous prime is 4135627. The next prime is 4135717. The reversal of 4135661 is 1665314.

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 2992900 + 1142761 = 1730^2 + 1069^2 .

It is a cyclic number.

It is not a de Polignac number, because 4135661 - 2¹⁸ = 3873517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 4135661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4131661) 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, 71276 + ... + 71333.

It is an arithmetic number, because the mean of its divisors is an integer number (1069575).

Almost surely, 2^4135661 is an apocalyptic number.

It is an amenable number.

4135661 is a deficient number, since it is larger than the sum of its proper divisors (142639).

4135661 is a wasteful number, since it uses less digits than its factorization.

4135661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142638.

The product of its digits is 2160, while the sum is 26.

The square root of 4135661 is about 2033.6324643357. The cubic root of 4135661 is about 160.5147613743.

The spelling of 4135661 in words is "four million, one hundred thirty-five thousand, six hundred sixty-one".