3981617971 has 2 divisors, whose sum is σ = 3981617972. Its totient is φ = 3981617970.

The previous prime is 3981617921. The next prime is 3981617977. The reversal of 3981617971 is 1797161893.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3981617971 - 2¹¹ = 3981615923 is a prime.

It is not a weakly prime, because it can be changed into another prime (3981617977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1990808985 + 1990808986.

It is an arithmetic number, because the mean of its divisors is an integer number (1990808986).

Almost surely, 2^3981617971 is an apocalyptic number.

3981617971 is a deficient number, since it is larger than the sum of its proper divisors (1).

3981617971 is an equidigital number, since it uses as much as digits as its factorization.

3981617971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 571536, while the sum is 52.

The square root of 3981617971 is about 63100.0631616166. The cubic root of 3981617971 is about 1584.9656798786.

The spelling of 3981617971 in words is "three billion, nine hundred eighty-one million, six hundred seventeen thousand, nine hundred seventy-one".