3971668331 has 4 divisors (see below), whose sum is σ = 3985802664. Its totient is φ = 3957534000.

The previous prime is 3971668321. The next prime is 3971668369. The reversal of 3971668331 is 1338661793.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3971668331 - 2²⁶ = 3904559467 is a prime.

It is a super-2 number, since 2×3971668331² = 31548298662936651122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3971668321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7066745 + ... + 7067306.

It is an arithmetic number, because the mean of its divisors is an integer number (996450666).

Almost surely, 2^3971668331 is an apocalyptic number.

3971668331 is a deficient number, since it is larger than the sum of its proper divisors (14134333).

3971668331 is a wasteful number, since it uses less digits than its factorization.

3971668331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14134332.

The product of its digits is 489888, while the sum is 47.

The square root of 3971668331 is about 63021.1736720287. The cubic root of 3971668331 is about 1583.6443584104.

The spelling of 3971668331 in words is "three billion, nine hundred seventy-one million, six hundred sixty-eight thousand, three hundred thirty-one".