4085681129 has 2 divisors, whose sum is σ = 4085681130. Its totient is φ = 4085681128.

The previous prime is 4085681101. The next prime is 4085681183. The reversal of 4085681129 is 9211865804.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3924771904 + 160909225 = 62648^2 + 12685^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4085681129 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4085681129.

It is not a weakly prime, because it can be changed into another prime (4085681629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2042840564 + 2042840565.

It is an arithmetic number, because the mean of its divisors is an integer number (2042840565).

Almost surely, 2^4085681129 is an apocalyptic number.

It is an amenable number.

4085681129 is a deficient number, since it is larger than the sum of its proper divisors (1).

4085681129 is an equidigital number, since it uses as much as digits as its factorization.

4085681129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 138240, while the sum is 44.

The square root of 4085681129 is about 63919.3329830655. The cubic root of 4085681129 is about 1598.6552671303.

The spelling of 4085681129 in words is "four billion, eighty-five million, six hundred eighty-one thousand, one hundred twenty-nine".