6649169 has 4 divisors (see below), whose sum is σ = 6654960. Its totient is φ = 6643380.

The previous prime is 6649163. The next prime is 6649189. The reversal of 6649169 is 9619466.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 6649169 - 2¹² = 6645073 is a prime.

It is a super-2 number, since 2×6649169² = 88422896781122, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6649163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 527 + ... + 3684.

It is an arithmetic number, because the mean of its divisors is an integer number (1663740).

Almost surely, 2^6649169 is an apocalyptic number.

It is an amenable number.

6649169 is a deficient number, since it is larger than the sum of its proper divisors (5791).

6649169 is a wasteful number, since it uses less digits than its factorization.

6649169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5790.

The product of its digits is 69984, while the sum is 41.

The square root of 6649169 is about 2578.5982626225. The cubic root of 6649169 is about 188.0424021605.

The spelling of 6649169 in words is "six million, six hundred forty-nine thousand, one hundred sixty-nine".