8251535521 has 4 divisors (see below), whose sum is σ = 8251801600. Its totient is φ = 8251269444.

The previous prime is 8251535489. The next prime is 8251535527. The reversal of 8251535521 is 1255351528.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8251535521 - 2⁵ = 8251535489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8251535527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79281 + ... + 150958.

It is an arithmetic number, because the mean of its divisors is an integer number (2062950400).

Almost surely, 2^8251535521 is an apocalyptic number.

It is an amenable number.

8251535521 is a deficient number, since it is larger than the sum of its proper divisors (266079).

8251535521 is a wasteful number, since it uses less digits than its factorization.

8251535521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266078.

The product of its digits is 60000, while the sum is 37.

The square root of 8251535521 is about 90837.9629945542. The cubic root of 8251535521 is about 2020.7453643306.

The spelling of 8251535521 in words is "eight billion, two hundred fifty-one million, five hundred thirty-five thousand, five hundred twenty-one".