8429733521 has 4 divisors (see below), whose sum is σ = 9196072944. Its totient is φ = 7663394100.

The previous prime is 8429733517. The next prime is 8429733583. The reversal of 8429733521 is 1253379248.

It is a happy number.

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 8429733521 - 2² = 8429733517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8429733721) 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, 383169695 + ... + 383169716.

It is an arithmetic number, because the mean of its divisors is an integer number (2299018236).

Almost surely, 2^8429733521 is an apocalyptic number.

It is an amenable number.

8429733521 is a deficient number, since it is larger than the sum of its proper divisors (766339423).

8429733521 is a wasteful number, since it uses less digits than its factorization.

8429733521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766339422.

The product of its digits is 362880, while the sum is 44.

The square root of 8429733521 is about 91813.5802645774. The cubic root of 8429733521 is about 2035.1883846233.

The spelling of 8429733521 in words is "eight billion, four hundred twenty-nine million, seven hundred thirty-three thousand, five hundred twenty-one".