3961881409 has 2 divisors, whose sum is σ = 3961881410. Its totient is φ = 3961881408.

The previous prime is 3961881397. The next prime is 3961881461. The reversal of 3961881409 is 9041881693.

3961881409 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3437242384 + 524639025 = 58628^2 + 22905^2 .

It is a cyclic number.

It is not a de Polignac number, because 3961881409 - 2¹⁵ = 3961848641 is a prime.

It is not a weakly prime, because it can be changed into another prime (3961881479) 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, 1980940704 + 1980940705.

It is an arithmetic number, because the mean of its divisors is an integer number (1980940705).

Almost surely, 2^3961881409 is an apocalyptic number.

It is an amenable number.

3961881409 is a deficient number, since it is larger than the sum of its proper divisors (1).

3961881409 is an equidigital number, since it uses as much as digits as its factorization.

3961881409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 373248, while the sum is 49.

The square root of 3961881409 is about 62943.4778908824. The cubic root of 3961881409 is about 1582.3424913884.

The spelling of 3961881409 in words is "three billion, nine hundred sixty-one million, eight hundred eighty-one thousand, four hundred nine".