8391291 has 8 divisors (see below), whose sum is σ = 11269440. Its totient is φ = 5553672.

The previous prime is 8391289. The next prime is 8391323. The reversal of 8391291 is 1921938.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8391291 - 2¹ = 8391289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8391211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9645 + ... + 10478.

It is an arithmetic number, because the mean of its divisors is an integer number (1408680).

Almost surely, 2^8391291 is an apocalyptic number.

8391291 is a deficient number, since it is larger than the sum of its proper divisors (2878149).

8391291 is a wasteful number, since it uses less digits than its factorization.

8391291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20265.

The product of its digits is 3888, while the sum is 33.

The square root of 8391291 is about 2896.7725143684. The cubic root of 8391291 is about 203.2089947219.

The spelling of 8391291 in words is "eight million, three hundred ninety-one thousand, two hundred ninety-one".