1004431321 has 4 divisors (see below), whose sum is σ = 1048102272. Its totient is φ = 960760372.

The previous prime is 1004431319. The next prime is 1004431343. The reversal of 1004431321 is 1231344001.

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 1004431321 - 2¹ = 1004431319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1004431361) 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, 21835441 + ... + 21835486.

It is an arithmetic number, because the mean of its divisors is an integer number (262025568).

Almost surely, 2^1004431321 is an apocalyptic number.

It is an amenable number.

1004431321 is a deficient number, since it is larger than the sum of its proper divisors (43670951).

1004431321 is an equidigital number, since it uses as much as digits as its factorization.

1004431321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43670950.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1004431321 is about 31692.7644897065. The cubic root of 1004431321 is about 1001.4749305105.

Adding to 1004431321 its reverse (1231344001), we get a palindrome (2235775322).

The spelling of 1004431321 in words is "one billion, four million, four hundred thirty-one thousand, three hundred twenty-one".