4131661 has 2 divisors, whose sum is σ = 4131662. Its totient is φ = 4131660.

The previous prime is 4131653. The next prime is 4131667. The reversal of 4131661 is 1661314.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2706025 + 1425636 = 1645^2 + 1194^2 .

It is a cyclic number.

It is not a de Polignac number, because 4131661 - 2³ = 4131653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4131667) 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 as a sum of consecutive naturals, namely, 2065830 + 2065831.

It is an arithmetic number, because the mean of its divisors is an integer number (2065831).

Almost surely, 2^4131661 is an apocalyptic number.

It is an amenable number.

4131661 is a deficient number, since it is larger than the sum of its proper divisors (1).

4131661 is an equidigital number, since it uses as much as digits as its factorization.

4131661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 22.

The square root of 4131661 is about 2032.6487645434. The cubic root of 4131661 is about 160.4629948686.

Adding to 4131661 its reverse (1661314), we get a palindrome (5792975).

The spelling of 4131661 in words is "four million, one hundred thirty-one thousand, six hundred sixty-one".