8423721291 has 16 divisors (see below), whose sum is σ = 11557405728. Its totient is φ = 5453510400.

The previous prime is 8423721277. The next prime is 8423721347. The reversal of 8423721291 is 1921273248.

It is not a de Polignac number, because 8423721291 - 2²² = 8419526987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8423721091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15000 + ... + 130661.

It is an arithmetic number, because the mean of its divisors is an integer number (722337858).

Almost surely, 2^8423721291 is an apocalyptic number.

8423721291 is a deficient number, since it is larger than the sum of its proper divisors (3133684437).

8423721291 is a wasteful number, since it uses less digits than its factorization.

8423721291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146222.

The product of its digits is 48384, while the sum is 39.

The square root of 8423721291 is about 91780.8329173363. The cubic root of 8423721291 is about 2034.7044258376.

The spelling of 8423721291 in words is "eight billion, four hundred twenty-three million, seven hundred twenty-one thousand, two hundred ninety-one".