6691149 has 24 divisors (see below), whose sum is σ = 10358712. Its totient is φ = 4147200.

The previous prime is 6691147. The next prime is 6691163. The reversal of 6691149 is 9411966.

It can be written as a sum of positive squares in 4 ways, for example, as 2205225 + 4485924 = 1485^2 + 2118^2 .

It is not a de Polignac number, because 6691149 - 2¹ = 6691147 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6691147) 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 23 ways as a sum of consecutive naturals, for example, 15237 + ... + 15669.

It is an arithmetic number, because the mean of its divisors is an integer number (431613).

Almost surely, 2^6691149 is an apocalyptic number.

It is an amenable number.

6691149 is a deficient number, since it is larger than the sum of its proper divisors (3667563).

6691149 is a wasteful number, since it uses less digits than its factorization.

6691149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557 (or 554 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 6691149 is about 2586.7255362717. The cubic root of 6691149 is about 188.4373119063.

The spelling of 6691149 in words is "six million, six hundred ninety-one thousand, one hundred forty-nine".