6899891 has 2 divisors, whose sum is σ = 6899892. Its totient is φ = 6899890.

The previous prime is 6899863. The next prime is 6899899. The reversal of 6899891 is 1989986.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6899891 - 2¹⁰ = 6898867 is a prime.

It is an Ulam number.

It is a plaindrome in base 13.

It is a nialpdrome in base 14.

It is not a weakly prime, because it can be changed into another prime (6899899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3449945 + 3449946.

It is an arithmetic number, because the mean of its divisors is an integer number (3449946).

Almost surely, 2^6899891 is an apocalyptic number.

6899891 is a deficient number, since it is larger than the sum of its proper divisors (1).

6899891 is an equidigital number, since it uses as much as digits as its factorization.

6899891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 50.

The square root of 6899891 is about 2626.7643594354. The cubic root of 6899891 is about 190.3768237184.

The spelling of 6899891 in words is "six million, eight hundred ninety-nine thousand, eight hundred ninety-one".