391071 has 8 divisors (see below), whose sum is σ = 530224. Its totient is φ = 256320.

The previous prime is 391067. The next prime is 391073. The reversal of 391071 is 170193.

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

It is not a de Polignac number, because 391071 - 2² = 391067 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391073) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 886 + ... + 1251.

It is an arithmetic number, because the mean of its divisors is an integer number (66278).

2³⁹¹⁰⁷¹ is an apocalyptic number.

391071 is a deficient number, since it is larger than the sum of its proper divisors (139153).

391071 is a wasteful number, since it uses less digits than its factorization.

391071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2201.

The product of its (nonzero) digits is 189, while the sum is 21.

The square root of 391071 is about 625.3566982131. The cubic root of 391071 is about 73.1282539278.

The spelling of 391071 in words is "three hundred ninety-one thousand, seventy-one".