3971521773 has 24 divisors (see below), whose sum is σ = 5979381408. Its totient is φ = 2634209424.

The previous prime is 3971521669. The next prime is 3971521777. The reversal of 3971521773 is 3771251793.

It is not a de Polignac number, because 3971521773 - 2²⁰ = 3970473197 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3971521777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6390 + ... + 89352.

It is an arithmetic number, because the mean of its divisors is an integer number (249140892).

Almost surely, 2^3971521773 is an apocalyptic number.

It is an amenable number.

3971521773 is a deficient number, since it is larger than the sum of its proper divisors (2007859635).

3971521773 is an equidigital number, since it uses as much as digits as its factorization.

3971521773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83175 (or 83163 counting only the distinct ones).

The product of its digits is 277830, while the sum is 45.

The square root of 3971521773 is about 63020.0108933662. The cubic root of 3971521773 is about 1583.6248788882.

The spelling of 3971521773 in words is "three billion, nine hundred seventy-one million, five hundred twenty-one thousand, seven hundred seventy-three".