4431221329 has 4 divisors (see below), whose sum is σ = 4539299940. Its totient is φ = 4323142720.

The previous prime is 4431221321. The next prime is 4431221359. The reversal of 4431221329 is 9231221344.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 652291600 + 3778929729 = 25540^2 + 61473^2 .

It is a cyclic number.

It is not a de Polignac number, because 4431221329 - 2³ = 4431221321 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4431221329.

It is not an unprimeable number, because it can be changed into a prime (4431221321) 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, 54039244 + ... + 54039325.

It is an arithmetic number, because the mean of its divisors is an integer number (1134824985).

Almost surely, 2^4431221329 is an apocalyptic number.

It is an amenable number.

4431221329 is a deficient number, since it is larger than the sum of its proper divisors (108078611).

4431221329 is a wasteful number, since it uses less digits than its factorization.

4431221329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108078610.

The product of its digits is 10368, while the sum is 31.

The square root of 4431221329 is about 66567.4194257221. The cubic root of 4431221329 is about 1642.5092127887.

The spelling of 4431221329 in words is "four billion, four hundred thirty-one million, two hundred twenty-one thousand, three hundred twenty-nine".