4099661 has 2 divisors, whose sum is σ = 4099662. Its totient is φ = 4099660.

The previous prime is 4099621. The next prime is 4099679. The reversal of 4099661 is 1669904.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4024036 + 75625 = 2006^2 + 275^2 .

It is a cyclic number.

It is not a de Polignac number, because 4099661 - 2⁶ = 4099597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4099621) 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, 2049830 + 2049831.

It is an arithmetic number, because the mean of its divisors is an integer number (2049831).

Almost surely, 2^4099661 is an apocalyptic number.

It is an amenable number.

4099661 is a deficient number, since it is larger than the sum of its proper divisors (1).

4099661 is an equidigital number, since it uses as much as digits as its factorization.

4099661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 4099661 is about 2024.7619613179. The cubic root of 4099661 is about 160.0476550756.

The spelling of 4099661 in words is "four million, ninety-nine thousand, six hundred sixty-one".