6812991 has 36 divisors (see below), whose sum is σ = 10869768. Its totient is φ = 4262544.

The previous prime is 6812987. The next prime is 6813007. The reversal of 6812991 is 1992186.

It is not a de Polignac number, because 6812991 - 2² = 6812987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6812891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 128521 + ... + 128573.

It is an arithmetic number, because the mean of its divisors is an integer number (301938).

Almost surely, 2^6812991 is an apocalyptic number.

6812991 is a deficient number, since it is larger than the sum of its proper divisors (4056777).

6812991 is an equidigital number, since it uses as much as digits as its factorization.

6812991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114 (or 79 counting only the distinct ones).

The product of its digits is 7776, while the sum is 36.

The square root of 6812991 is about 2610.1706840741. The cubic root of 6812991 is about 189.5742173722.

It can be divided in two parts, 68 and 12991, that multiplied together give a palindrome (883388).

The spelling of 6812991 in words is "six million, eight hundred twelve thousand, nine hundred ninety-one".