3981567971 has 16 divisors (see below), whose sum is σ = 4254656640. Its totient is φ = 3714984000.

The previous prime is 3981567959. The next prime is 3981568013. The reversal of 3981567971 is 1797651893.

It is a cyclic number.

It is not a de Polignac number, because 3981567971 - 2⁶ = 3981567907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3981567871) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1223096 + ... + 1226346.

It is an arithmetic number, because the mean of its divisors is an integer number (265916040).

Almost surely, 2^3981567971 is an apocalyptic number.

3981567971 is a deficient number, since it is larger than the sum of its proper divisors (273088669).

3981567971 is a wasteful number, since it uses less digits than its factorization.

3981567971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4226.

The product of its digits is 2857680, while the sum is 56.

The square root of 3981567971 is about 63099.6669642558. Note that the first 3 decimals coincide. The cubic root of 3981567971 is about 1584.9590453382.

The spelling of 3981567971 in words is "three billion, nine hundred eighty-one million, five hundred sixty-seven thousand, nine hundred seventy-one".