8813513521 has 2 divisors, whose sum is σ = 8813513522. Its totient is φ = 8813513520.

The previous prime is 8813513519. The next prime is 8813513557. The reversal of 8813513521 is 1253153188.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5455890496 + 3357623025 = 73864^2 + 57945^2 .

It is a cyclic number.

It is not a de Polignac number, because 8813513521 - 2¹ = 8813513519 is a prime.

Together with 8813513519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (8813513591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4406756760 + 4406756761.

It is an arithmetic number, because the mean of its divisors is an integer number (4406756761).

Almost surely, 2^8813513521 is an apocalyptic number.

It is an amenable number.

8813513521 is a deficient number, since it is larger than the sum of its proper divisors (1).

8813513521 is an equidigital number, since it uses as much as digits as its factorization.

8813513521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28800, while the sum is 37.

The square root of 8813513521 is about 93880.3148748448. The cubic root of 8813513521 is about 2065.6164888347.

The spelling of 8813513521 in words is "eight billion, eight hundred thirteen million, five hundred thirteen thousand, five hundred twenty-one".