8518921 has 8 divisors (see below), whose sum is σ = 9054504. Its totient is φ = 7987200.

The previous prime is 8518907. The next prime is 8518931. The reversal of 8518921 is 1298158.

8518921 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 2368521 + 6150400 = 1539^2 + 2480^2 .

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 8518921 - 2⁵ = 8518889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8518931) by changing a digit.

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, 4521 + ... + 6121.

It is an arithmetic number, because the mean of its divisors is an integer number (1131813).

Almost surely, 2^8518921 is an apocalyptic number.

It is an amenable number.

8518921 is a deficient number, since it is larger than the sum of its proper divisors (535583).

8518921 is a wasteful number, since it uses less digits than its factorization.

8518921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1931.

The product of its digits is 5760, while the sum is 34.

The square root of 8518921 is about 2918.7190683586. The cubic root of 8518921 is about 204.2340722783.

The spelling of 8518921 in words is "eight million, five hundred eighteen thousand, nine hundred twenty-one".