3959950681 has 2 divisors, whose sum is σ = 3959950682. Its totient is φ = 3959950680.

The previous prime is 3959950637. The next prime is 3959950691. The reversal of 3959950681 is 1860599593.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3602400400 + 357550281 = 60020^2 + 18909^2 .

It is an emirp because it is prime and its reverse (1860599593) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3959950681 - 2²³ = 3951562073 is a prime.

It is a super-2 number, since 2×3959950681² = 31362418791904727522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3959950691) 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, 1979975340 + 1979975341.

It is an arithmetic number, because the mean of its divisors is an integer number (1979975341).

Almost surely, 2^3959950681 is an apocalyptic number.

It is an amenable number.

3959950681 is a deficient number, since it is larger than the sum of its proper divisors (1).

3959950681 is an equidigital number, since it uses as much as digits as its factorization.

3959950681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2624400, while the sum is 55.

The square root of 3959950681 is about 62928.1390238103. The cubic root of 3959950681 is about 1582.0854107201.

The spelling of 3959950681 in words is "three billion, nine hundred fifty-nine million, nine hundred fifty thousand, six hundred eighty-one".