8491518 has 48 divisors (see below), whose sum is σ = 22139520. Its totient is φ = 2297808.

The previous prime is 8491507. The next prime is 8491541. The reversal of 8491518 is 8151948.

8491518 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 621 + ... + 4167.

It is an arithmetic number, because the mean of its divisors is an integer number (461240).

Almost surely, 2^8491518 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8491518, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11069760).

8491518 is an abundant number, since it is smaller than the sum of its proper divisors (13648002).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8491518 is a wasteful number, since it uses less digits than its factorization.

8491518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3581 (or 3578 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 8491518 is about 2914.0209333497. The cubic root of 8491518 is about 204.0148489768.

It can be divided in two parts, 8491 and 518, that added together give a palindrome (9009).

The spelling of 8491518 in words is "eight million, four hundred ninety-one thousand, five hundred eighteen".