3971828971829 has 2 divisors, whose sum is σ = 3971828971830. Its totient is φ = 3971828971828.

The previous prime is 3971828971783. The next prime is 3971828971897. The reversal of 3971828971829 is 9281798281793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3302132249329 + 669696722500 = 1817177^2 + 818350^2 .

It is a cyclic number.

It is not a de Polignac number, because 3971828971829 - 2³⁶ = 3903109495093 is a prime.

It is a super-2 number, since 2×3971828971829² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3971828973829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1985914485914 + 1985914485915.

It is an arithmetic number, because the mean of its divisors is an integer number (1985914485915).

Almost surely, 2^{3971828971829} is an apocalyptic number.

It is an amenable number.

3971828971829 is a deficient number, since it is larger than the sum of its proper divisors (1).

3971828971829 is an equidigital number, since it uses as much as digits as its factorization.

3971828971829 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 219469824, while the sum is 74.

The spelling of 3971828971829 in words is "three trillion, nine hundred seventy-one billion, eight hundred twenty-eight million, nine hundred seventy-one thousand, eight hundred twenty-nine".