6815813 has 4 divisors (see below), whose sum is σ = 7174560. Its totient is φ = 6457068.

The previous prime is 6815803. The next prime is 6815833. The reversal of 6815813 is 3185186.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6815813 - 2⁶ = 6815749 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6815813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6815803) 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, 179345 + ... + 179382.

It is an arithmetic number, because the mean of its divisors is an integer number (1793640).

Almost surely, 2^6815813 is an apocalyptic number.

It is an amenable number.

6815813 is a deficient number, since it is larger than the sum of its proper divisors (358747).

6815813 is a wasteful number, since it uses less digits than its factorization.

6815813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358746.

The product of its digits is 5760, while the sum is 32.

The square root of 6815813 is about 2610.7112057828. The cubic root of 6815813 is about 189.6003881878.

The spelling of 6815813 in words is "six million, eight hundred fifteen thousand, eight hundred thirteen".