3961881689 has 2 divisors, whose sum is σ = 3961881690. Its totient is φ = 3961881688.

The previous prime is 3961881641. The next prime is 3961881709. The reversal of 3961881689 is 9861881693.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2430490000 + 1531391689 = 49300^2 + 39133^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3961881689 is a prime.

It is a super-3 number, since 3×3961881689³ (a number of 30 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (3961881089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1980940844 + 1980940845.

It is an arithmetic number, because the mean of its divisors is an integer number (1980940845).

Almost surely, 2^3961881689 is an apocalyptic number.

It is an amenable number.

3961881689 is a deficient number, since it is larger than the sum of its proper divisors (1).

3961881689 is an equidigital number, since it uses as much as digits as its factorization.

3961881689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4478976, while the sum is 59.

The square root of 3961881689 is about 62943.4801151001. The cubic root of 3961881689 is about 1582.3425286649.

The spelling of 3961881689 in words is "three billion, nine hundred sixty-one million, eight hundred eighty-one thousand, six hundred eighty-nine".