8521993013 has 4 divisors (see below), whose sum is σ = 8682785388. Its totient is φ = 8361200640.

The previous prime is 8521993009. The next prime is 8521993027. The reversal of 8521993013 is 3103991258.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5201582884 + 3320410129 = 72122^2 + 57623^2 .

It is a cyclic number.

It is not a de Polignac number, because 8521993013 - 2² = 8521993009 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8521993043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80396108 + ... + 80396213.

It is an arithmetic number, because the mean of its divisors is an integer number (2170696347).

Almost surely, 2^8521993013 is an apocalyptic number.

It is an amenable number.

8521993013 is a deficient number, since it is larger than the sum of its proper divisors (160792375).

8521993013 is a wasteful number, since it uses less digits than its factorization.

8521993013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160792374.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 8521993013 is about 92314.6413793608. The cubic root of 8521993013 is about 2042.5861898332.

The spelling of 8521993013 in words is "eight billion, five hundred twenty-one million, nine hundred ninety-three thousand, thirteen".