3959599561 has 2 divisors, whose sum is σ = 3959599562. Its totient is φ = 3959599560.

The previous prime is 3959599549. The next prime is 3959599603. The reversal of 3959599561 is 1659959593.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2177155600 + 1782443961 = 46660^2 + 42219^2 .

It is a cyclic number.

It is not a de Polignac number, because 3959599561 - 2²³ = 3951210953 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3959599561.

It is not a weakly prime, because it can be changed into another prime (3959599541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1979799780 + 1979799781.

It is an arithmetic number, because the mean of its divisors is an integer number (1979799781).

Almost surely, 2^3959599561 is an apocalyptic number.

It is an amenable number.

3959599561 is a deficient number, since it is larger than the sum of its proper divisors (1).

3959599561 is an equidigital number, since it uses as much as digits as its factorization.

3959599561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14762250, while the sum is 61.

The square root of 3959599561 is about 62925.3491130562. The cubic root of 3959599561 is about 1582.0386493424.

The spelling of 3959599561 in words is "three billion, nine hundred fifty-nine million, five hundred ninety-nine thousand, five hundred sixty-one".