6812181 has 20 divisors (see below), whose sum is σ = 10455852. Its totient is φ = 4416768.

The previous prime is 6812177. The next prime is 6812207. The reversal of 6812181 is 1812186.

It can be written as a sum of positive squares in 2 ways, for example, as 6081156 + 731025 = 2466^2 + 855^2 .

It is not a de Polignac number, because 6812181 - 2² = 6812177 is a prime.

It is a super-2 number, since 2×6812181² = 92811619953522, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6812161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1861 + ... + 4133.

Almost surely, 2^6812181 is an apocalyptic number.

It is an amenable number.

6812181 is a deficient number, since it is larger than the sum of its proper divisors (3643671).

6812181 is a wasteful number, since it uses less digits than its factorization.

6812181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2322 (or 2313 counting only the distinct ones).

The product of its digits is 768, while the sum is 27.

The square root of 6812181 is about 2610.0155171953. The cubic root of 6812181 is about 189.5667042157.

It can be divided in two parts, 68121 and 81, that multiplied together give a square (5517801 = 2349²).

The spelling of 6812181 in words is "six million, eight hundred twelve thousand, one hundred eighty-one".