6891149 has 2 divisors, whose sum is σ = 6891150. Its totient is φ = 6891148.

The previous prime is 6891133. The next prime is 6891161. The reversal of 6891149 is 9411986.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6375625 + 515524 = 2525^2 + 718^2 .

It is a cyclic number.

It is not a de Polignac number, because 6891149 - 2⁴ = 6891133 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6891119) 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, 3445574 + 3445575.

It is an arithmetic number, because the mean of its divisors is an integer number (3445575).

Almost surely, 2^6891149 is an apocalyptic number.

It is an amenable number.

6891149 is a deficient number, since it is larger than the sum of its proper divisors (1).

6891149 is an equidigital number, since it uses as much as digits as its factorization.

6891149 is an odious number, because the sum of its binary digits is odd.

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

The square root of 6891149 is about 2625.0998076264. The cubic root of 6891149 is about 190.2963887496.

It can be divided in two parts, 689114 and 9, that multiplied together give a palindrome (6202026).

The spelling of 6891149 in words is "six million, eight hundred ninety-one thousand, one hundred forty-nine".