6813155 has 4 divisors (see below), whose sum is σ = 8175792. Its totient is φ = 5450520.

The previous prime is 6813139. The next prime is 6813181. The reversal of 6813155 is 5513186.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 6813155 - 2⁴ = 6813139 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 681311 + ... + 681320.

It is an arithmetic number, because the mean of its divisors is an integer number (2043948).

Almost surely, 2^6813155 is an apocalyptic number.

6813155 is a deficient number, since it is larger than the sum of its proper divisors (1362637).

6813155 is a wasteful number, since it uses less digits than its factorization.

6813155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1362636.

The product of its digits is 3600, while the sum is 29.

The square root of 6813155 is about 2610.2020994551. The cubic root of 6813155 is about 189.5757384820.

It can be divided in two parts, 68131 and 55, that added together give a palindrome (68186).

The spelling of 6813155 in words is "six million, eight hundred thirteen thousand, one hundred fifty-five".