3971646441 has 27 divisors (see below), whose sum is σ = 6675671223. Its totient is φ = 2268756000.

The previous prime is 3971646439. The next prime is 3971646457. The reversal of 3971646441 is 1446461793.

The square root of 3971646441 is 63021.

It is a perfect power (a square), and thus also a powerful number.

3971646441 is a `hidden beast` number, since 397 + 164 + 64 + 41 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2136380841 + 1835265600 = 46221^2 + 42840^2 .

It is not a de Polignac number, because 3971646441 - 2¹ = 3971646439 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3971646421) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1321941 + ... + 1324941.

Almost surely, 2^3971646441 is an apocalyptic number.

3971646441 is the 63021-st square number.

3971646441 is the 31511-st centered octagonal number.

It is an amenable number.

3971646441 is a deficient number, since it is larger than the sum of its proper divisors (2704024782).

3971646441 is an frugal number, since it uses more digits than its factorization.

3971646441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6022 (or 3011 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The cubic root of 3971646441 is about 1583.6414489665.

The spelling of 3971646441 in words is "three billion, nine hundred seventy-one million, six hundred forty-six thousand, four hundred forty-one".