3971191 has 8 divisors (see below), whose sum is σ = 4553120. Its totient is φ = 3392928.

The previous prime is 3971167. The next prime is 3971207. The reversal of 3971191 is 1911793.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3971191 - 2⁷ = 3971063 is a prime.

It is a Duffinian number.

3971191 is a modest number, since divided by 1191 gives 397 as remainder.

3971191 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3971141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2065 + ... + 3493.

It is an arithmetic number, because the mean of its divisors is an integer number (569140).

Almost surely, 2^3971191 is an apocalyptic number.

3971191 is a deficient number, since it is larger than the sum of its proper divisors (581929).

3971191 is a wasteful number, since it uses less digits than its factorization.

3971191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1833.

The product of its digits is 1701, while the sum is 31.

The square root of 3971191 is about 1992.7847349877. The cubic root of 3971191 is about 158.3580912962.

The spelling of 3971191 in words is "three million, nine hundred seventy-one thousand, one hundred ninety-one".