8291521 has 8 divisors (see below), whose sum is σ = 9563840. Its totient is φ = 7041168.

The previous prime is 8291519. The next prime is 8291527. The reversal of 8291521 is 1251928.

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

It is a cyclic number.

It is not a de Polignac number, because 8291521 - 2¹ = 8291519 is a prime.

It is the 2880-th Hogben number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8291521.

It is not an unprimeable number, because it can be changed into a prime (8291527) by changing a digit.

It is a nontrivial repunit in base 2879.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4671 + ... + 6196.

It is an arithmetic number, because the mean of its divisors is an integer number (1195480).

Almost surely, 2^8291521 is an apocalyptic number.

It is an amenable number.

8291521 is a deficient number, since it is larger than the sum of its proper divisors (1272319).

8291521 is a wasteful number, since it uses less digits than its factorization.

8291521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10983.

The product of its digits is 1440, while the sum is 28.

The square root of 8291521 is about 2879.5001302309. The cubic root of 8291521 is about 202.4004164119.

The spelling of 8291521 in words is "eight million, two hundred ninety-one thousand, five hundred twenty-one".