391271 has 4 divisors (see below), whose sum is σ = 392544. Its totient is φ = 390000.

The previous prime is 391249. The next prime is 391273. The reversal of 391271 is 172193.

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.

It is a cyclic number.

It is not a de Polignac number, because 391271 - 2¹⁴ = 374887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391273) 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, 146 + ... + 896.

It is an arithmetic number, because the mean of its divisors is an integer number (98136).

2³⁹¹²⁷¹ is an apocalyptic number.

391271 is a deficient number, since it is larger than the sum of its proper divisors (1273).

391271 is an equidigital number, since it uses as much as digits as its factorization.

391271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1272.

The product of its digits is 378, while the sum is 23.

The square root of 391271 is about 625.5165865107. The cubic root of 391271 is about 73.1407181251.

The spelling of 391271 in words is "three hundred ninety-one thousand, two hundred seventy-one".