6687149 has 4 divisors (see below), whose sum is σ = 7642464. Its totient is φ = 5731836.

The previous prime is 6687143. The next prime is 6687167. The reversal of 6687149 is 9417866.

6687149 = 1492² + 1493² + 1494².

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6687149 - 2⁴ = 6687133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6687143) 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 in 3 ways as a sum of consecutive naturals, for example, 477647 + ... + 477660.

It is an arithmetic number, because the mean of its divisors is an integer number (1910616).

Almost surely, 2^6687149 is an apocalyptic number.

It is an amenable number.

6687149 is a deficient number, since it is larger than the sum of its proper divisors (955315).

6687149 is an equidigital number, since it uses as much as digits as its factorization.

6687149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 955314.

The product of its digits is 72576, while the sum is 41.

The square root of 6687149 is about 2585.9522424051. The cubic root of 6687149 is about 188.3997548541.

The spelling of 6687149 in words is "six million, six hundred eighty-seven thousand, one hundred forty-nine".