4129661 has 2 divisors, whose sum is σ = 4129662. Its totient is φ = 4129660.

The previous prime is 4129651. The next prime is 4129667. The reversal of 4129661 is 1669214.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4024036 + 105625 = 2006^2 + 325^2 .

It is a cyclic number.

It is not a de Polignac number, because 4129661 - 2⁶ = 4129597 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4129667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2064830 + 2064831.

It is an arithmetic number, because the mean of its divisors is an integer number (2064831).

Almost surely, 2^4129661 is an apocalyptic number.

It is an amenable number.

4129661 is a deficient number, since it is larger than the sum of its proper divisors (1).

4129661 is an equidigital number, since it uses as much as digits as its factorization.

4129661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 29.

The square root of 4129661 is about 2032.1567360812. The cubic root of 4129661 is about 160.4370990859.

The spelling of 4129661 in words is "four million, one hundred twenty-nine thousand, six hundred sixty-one".