8391521060 has 48 divisors (see below), whose sum is σ = 19029674496. Its totient is φ = 3089930112.

The previous prime is 8391521051. The next prime is 8391521069. The reversal of 8391521060 is 601251938.

It is an interprime number because it is at equal distance from previous prime (8391521051) and next prime (8391521069).

It is a self number, because there is not a number n which added to its sum of digits gives 8391521060.

It is not an unprimeable number, because it can be changed into a prime (8391521069) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51449 + ... + 139391.

It is an arithmetic number, because the mean of its divisors is an integer number (396451552).

Almost surely, 2^8391521060 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8391521060, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9514837248).

8391521060 is an abundant number, since it is smaller than the sum of its proper divisors (10638153436).

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

8391521060 is a wasteful number, since it uses less digits than its factorization.

8391521060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88332 (or 88330 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 8391521060 is about 91605.2458104884. The cubic root of 8391521060 is about 2032.1085179945.

Adding to 8391521060 its reverse (601251938), we get a palindrome (8992772998).

The spelling of 8391521060 in words is "eight billion, three hundred ninety-one million, five hundred twenty-one thousand, sixty".