6855391 has 4 divisors (see below), whose sum is σ = 6984792. Its totient is φ = 6725992.

The previous prime is 6855379. The next prime is 6855413. The reversal of 6855391 is 1935586.

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 6855391 - 2¹⁵ = 6822623 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 6855391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6855491) 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, 64621 + ... + 64726.

It is an arithmetic number, because the mean of its divisors is an integer number (1746198).

Almost surely, 2^6855391 is an apocalyptic number.

6855391 is a deficient number, since it is larger than the sum of its proper divisors (129401).

6855391 is a wasteful number, since it uses less digits than its factorization.

6855391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129400.

The product of its digits is 32400, while the sum is 37.

The square root of 6855391 is about 2618.2801607162. The cubic root of 6855391 is about 189.9666700539.

It can be divided in two parts, 68553 and 91, that added together give a square (68644 = 262²).

The spelling of 6855391 in words is "six million, eight hundred fifty-five thousand, three hundred ninety-one".