6669191 has 4 divisors (see below), whose sum is σ = 6778584. Its totient is φ = 6559800.

The previous prime is 6669163. The next prime is 6669197. The reversal of 6669191 is 1919666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6669191 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 (6669197) 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, 54605 + ... + 54726.

It is an arithmetic number, because the mean of its divisors is an integer number (1694646).

Almost surely, 2^6669191 is an apocalyptic number.

6669191 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

6669191 is a deficient number, since it is larger than the sum of its proper divisors (109393).

6669191 is a wasteful number, since it uses less digits than its factorization.

6669191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109392.

The product of its digits is 17496, while the sum is 38.

The square root of 6669191 is about 2582.4776862540. The cubic root of 6669191 is about 188.2309576647.

The spelling of 6669191 in words is "six million, six hundred sixty-nine thousand, one hundred ninety-one".