3951971 has 4 divisors (see below), whose sum is σ = 3956112. Its totient is φ = 3947832.

The previous prime is 3951967. The next prime is 3951977. The reversal of 3951971 is 1791593.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1791593 = 47 ⋅38119.

It is a cyclic number.

It is not a de Polignac number, because 3951971 - 2² = 3951967 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3951977) 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, 170 + ... + 2816.

It is an arithmetic number, because the mean of its divisors is an integer number (989028).

Almost surely, 2^3951971 is an apocalyptic number.

3951971 is a deficient number, since it is larger than the sum of its proper divisors (4141).

3951971 is a wasteful number, since it uses less digits than its factorization.

3951971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4140.

The product of its digits is 8505, while the sum is 35.

The square root of 3951971 is about 1987.9564884574. The cubic root of 3951971 is about 158.1022011425.

The spelling of 3951971 in words is "three million, nine hundred fifty-one thousand, nine hundred seventy-one".