8009791521 has 4 divisors (see below), whose sum is σ = 10679722032. Its totient is φ = 5339861012.

The previous prime is 8009791513. The next prime is 8009791583. The reversal of 8009791521 is 1251979008.

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 8009791521 - 2³ = 8009791513 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8009791121) 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, 1334965251 + ... + 1334965256.

It is an arithmetic number, because the mean of its divisors is an integer number (2669930508).

Almost surely, 2^8009791521 is an apocalyptic number.

It is an amenable number.

8009791521 is a deficient number, since it is larger than the sum of its proper divisors (2669930511).

8009791521 is a wasteful number, since it uses less digits than its factorization.

8009791521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2669930510.

The product of its (nonzero) digits is 45360, while the sum is 42.

The square root of 8009791521 is about 89497.4386281529. The cubic root of 8009791521 is about 2000.8156274141.

The spelling of 8009791521 in words is "eight billion, nine million, seven hundred ninety-one thousand, five hundred twenty-one".