3171391 has 4 divisors (see below), whose sum is σ = 3248784. Its totient is φ = 3094000.

The previous prime is 3171383. The next prime is 3171403. The reversal of 3171391 is 1931713.

3171391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 3171391 - 2³ = 3171383 is a prime.

It is a Duffinian number.

3171391 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3172391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38635 + ... + 38716.

It is an arithmetic number, because the mean of its divisors is an integer number (812196).

Almost surely, 2^3171391 is an apocalyptic number.

3171391 is a deficient number, since it is larger than the sum of its proper divisors (77393).

3171391 is an equidigital number, since it uses as much as digits as its factorization.

3171391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77392.

The product of its digits is 567, while the sum is 25.

The square root of 3171391 is about 1780.8399703511. The cubic root of 3171391 is about 146.9207927832.

The spelling of 3171391 in words is "three million, one hundred seventy-one thousand, three hundred ninety-one".