813391 has 8 divisors (see below), whose sum is σ = 842400. Its totient is φ = 784992.

The previous prime is 813383. The next prime is 813401. The reversal of 813391 is 193318.

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

It is a cyclic number.

It is not a de Polignac number, because 813391 - 2³ = 813383 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 (813301) 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 7 ways as a sum of consecutive naturals, for example, 5385 + ... + 5533.

It is an arithmetic number, because the mean of its divisors is an integer number (105300).

2⁸¹³³⁹¹ is an apocalyptic number.

813391 is a deficient number, since it is larger than the sum of its proper divisors (29009).

813391 is a wasteful number, since it uses less digits than its factorization.

813391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305.

The product of its digits is 648, while the sum is 25.

The square root of 813391 is about 901.8819213179. The cubic root of 813391 is about 93.3468758694.

The spelling of 813391 in words is "eight hundred thirteen thousand, three hundred ninety-one".