6631291 has 4 divisors (see below), whose sum is σ = 6919632. Its totient is φ = 6342952.

The previous prime is 6631279. The next prime is 6631321. The reversal of 6631291 is 1921366.

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 6631291 - 2⁹ = 6630779 is a prime.

It is a Duffinian number.

6631291 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6631271) 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, 144136 + ... + 144181.

It is an arithmetic number, because the mean of its divisors is an integer number (1729908).

Almost surely, 2^6631291 is an apocalyptic number.

6631291 is a deficient number, since it is larger than the sum of its proper divisors (288341).

6631291 is a wasteful number, since it uses less digits than its factorization.

6631291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288340.

The product of its digits is 1944, while the sum is 28.

The square root of 6631291 is about 2575.1293171412. The cubic root of 6631291 is about 187.8737174414.

The spelling of 6631291 in words is "six million, six hundred thirty-one thousand, two hundred ninety-one".