3961681931 has 2 divisors, whose sum is σ = 3961681932. Its totient is φ = 3961681930.

The previous prime is 3961681907. The next prime is 3961681939. The reversal of 3961681931 is 1391861693.

It is a happy number.

3961681931 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3961681931 is a prime.

It is a super-2 number, since 2×3961681931² = 31389847444823777522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3961681939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1980840965 + 1980840966.

It is an arithmetic number, because the mean of its divisors is an integer number (1980840966).

Almost surely, 2^3961681931 is an apocalyptic number.

3961681931 is a deficient number, since it is larger than the sum of its proper divisors (1).

3961681931 is an equidigital number, since it uses as much as digits as its factorization.

3961681931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 47.

The square root of 3961681931 is about 62941.8932905581. The cubic root of 3961681931 is about 1582.3159343245.

The spelling of 3961681931 in words is "three billion, nine hundred sixty-one million, six hundred eighty-one thousand, nine hundred thirty-one".