391147 has 4 divisors (see below), whose sum is σ = 392400. Its totient is φ = 389896.

The previous prime is 391133. The next prime is 391151. The reversal of 391147 is 741193.

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 391147 - 2⁷ = 391019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391117) 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, 273 + ... + 925.

It is an arithmetic number, because the mean of its divisors is an integer number (98100).

2³⁹¹¹⁴⁷ is an apocalyptic number.

391147 is a deficient number, since it is larger than the sum of its proper divisors (1253).

391147 is an equidigital number, since it uses as much as digits as its factorization.

391147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1252.

The product of its digits is 756, while the sum is 25.

The square root of 391147 is about 625.4174605813. The cubic root of 391147 is about 73.1329908233.

The spelling of 391147 in words is "three hundred ninety-one thousand, one hundred forty-seven".