6812581 has 2 divisors, whose sum is σ = 6812582. Its totient is φ = 6812580.

The previous prime is 6812573. The next prime is 6812629. The reversal of 6812581 is 1852186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3481956 + 3330625 = 1866^2 + 1825^2 .

It is a cyclic number.

It is not a de Polignac number, because 6812581 - 2³ = 6812573 is a prime.

It is a super-2 number, since 2×6812581² = 92822519763122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6812381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3406290 + 3406291.

It is an arithmetic number, because the mean of its divisors is an integer number (3406291).

Almost surely, 2^6812581 is an apocalyptic number.

It is an amenable number.

6812581 is a deficient number, since it is larger than the sum of its proper divisors (1).

6812581 is an equidigital number, since it uses as much as digits as its factorization.

6812581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3840, while the sum is 31.

The square root of 6812581 is about 2610.0921439673. The cubic root of 6812581 is about 189.5704144909.

The spelling of 6812581 in words is "six million, eight hundred twelve thousand, five hundred eighty-one".