6690291 has 4 divisors (see below), whose sum is σ = 8920392. Its totient is φ = 4460192.

The previous prime is 6690289. The next prime is 6690319. The reversal of 6690291 is 1920966.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 6690291 - 2¹ = 6690289 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (6690221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1115046 + ... + 1115051.

It is an arithmetic number, because the mean of its divisors is an integer number (2230098).

Almost surely, 2^6690291 is an apocalyptic number.

6690291 is a deficient number, since it is larger than the sum of its proper divisors (2230101).

6690291 is a wasteful number, since it uses less digits than its factorization.

6690291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2230100.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 6690291 is about 2586.5596842138. The cubic root of 6690291 is about 188.4292571798.

The spelling of 6690291 in words is "six million, six hundred ninety thousand, two hundred ninety-one".