6814991 has 2 divisors, whose sum is σ = 6814992. Its totient is φ = 6814990.

The previous prime is 6814961. The next prime is 6814999. The reversal of 6814991 is 1994186.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6814991 - 2¹⁴ = 6798607 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6814999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3407495 + 3407496.

It is an arithmetic number, because the mean of its divisors is an integer number (3407496).

Almost surely, 2^6814991 is an apocalyptic number.

6814991 is a deficient number, since it is larger than the sum of its proper divisors (1).

6814991 is an equidigital number, since it uses as much as digits as its factorization.

6814991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 38.

The square root of 6814991 is about 2610.5537726697. The cubic root of 6814991 is about 189.5927658257.

The spelling of 6814991 in words is "six million, eight hundred fourteen thousand, nine hundred ninety-one".