3971828971897 has 2 divisors, whose sum is σ = 3971828971898. Its totient is φ = 3971828971896.

The previous prime is 3971828971829. The next prime is 3971828971921. The reversal of 3971828971897 is 7981798281793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2761100662336 + 1210728309561 = 1661656^2 + 1100331^2 .

It is a cyclic number.

It is not a de Polignac number, because 3971828971897 - 2⁷ = 3971828971769 is a prime.

It is not a weakly prime, because it can be changed into another prime (3971828972897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1985914485948 + 1985914485949.

It is an arithmetic number, because the mean of its divisors is an integer number (1985914485949).

Almost surely, 2^{3971828971897} is an apocalyptic number.

It is an amenable number.

3971828971897 is a deficient number, since it is larger than the sum of its proper divisors (1).

3971828971897 is an equidigital number, since it uses as much as digits as its factorization.

3971828971897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 768144384, while the sum is 79.

The spelling of 3971828971897 in words is "three trillion, nine hundred seventy-one billion, eight hundred twenty-eight million, nine hundred seventy-one thousand, eight hundred ninety-seven".