6813491 has 2 divisors, whose sum is σ = 6813492. Its totient is φ = 6813490.

The previous prime is 6813487. The next prime is 6813509. The reversal of 6813491 is 1943186.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6813491 - 2² = 6813487 is a prime.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (6813091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3406745 + 3406746.

It is an arithmetic number, because the mean of its divisors is an integer number (3406746).

Almost surely, 2^6813491 is an apocalyptic number.

6813491 is a deficient number, since it is larger than the sum of its proper divisors (1).

6813491 is an equidigital number, since it uses as much as digits as its factorization.

6813491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 32.

The square root of 6813491 is about 2610.2664614939. The cubic root of 6813491 is about 189.5788548258.

The spelling of 6813491 in words is "six million, eight hundred thirteen thousand, four hundred ninety-one".