3931971 has 4 divisors (see below), whose sum is σ = 5242632. Its totient is φ = 2621312.

The previous prime is 3931969. The next prime is 3931997. The reversal of 3931971 is 1791393.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1791393 = 3 ⋅597131.

It is a cyclic number.

It is not a de Polignac number, because 3931971 - 2¹ = 3931969 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (3933971) 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, 655326 + ... + 655331.

It is an arithmetic number, because the mean of its divisors is an integer number (1310658).

Almost surely, 2^3931971 is an apocalyptic number.

3931971 is a deficient number, since it is larger than the sum of its proper divisors (1310661).

3931971 is a wasteful number, since it uses less digits than its factorization.

3931971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1310660.

The product of its digits is 5103, while the sum is 33.

The square root of 3931971 is about 1982.9198168358. The cubic root of 3931971 is about 157.8350438859.

The spelling of 3931971 in words is "three million, nine hundred thirty-one thousand, nine hundred seventy-one".