4099961 has 2 divisors, whose sum is σ = 4099962. Its totient is φ = 4099960.

The previous prime is 4099943. The next prime is 4099981. The reversal of 4099961 is 1699904.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3367225 + 732736 = 1835^2 + 856^2 .

It is a cyclic number.

It is not a de Polignac number, because 4099961 - 2⁶ = 4099897 is a prime.

It is not a weakly prime, because it can be changed into another prime (4099981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2049980 + 2049981.

It is an arithmetic number, because the mean of its divisors is an integer number (2049981).

Almost surely, 2^4099961 is an apocalyptic number.

It is an amenable number.

4099961 is a deficient number, since it is larger than the sum of its proper divisors (1).

4099961 is an equidigital number, since it uses as much as digits as its factorization.

4099961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 4099961 is about 2024.8360427452. The cubic root of 4099961 is about 160.0515589045.

It can be divided in two parts, 40 and 99961, that added together give a palindrome (100001).

The spelling of 4099961 in words is "four million, ninety-nine thousand, nine hundred sixty-one".