1431443321 has 24 divisors (see below), whose sum is σ = 1875144960. Its totient is φ = 1079416800.

The previous prime is 1431443311. The next prime is 1431443323. The reversal of 1431443321 is 1233441341.

It is a happy number.

It is not a de Polignac number, because 1431443321 - 2¹⁰ = 1431442297 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1431443323) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26126 + ... + 59543.

It is an arithmetic number, because the mean of its divisors is an integer number (78131040).

Almost surely, 2^1431443321 is an apocalyptic number.

1431443321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1431443321 is a deficient number, since it is larger than the sum of its proper divisors (443701639).

1431443321 is a wasteful number, since it uses less digits than its factorization.

1431443321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85725 (or 85718 counting only the distinct ones).

The product of its digits is 3456, while the sum is 26.

The square root of 1431443321 is about 37834.4197920359. The cubic root of 1431443321 is about 1127.0020832491.

Adding to 1431443321 its reverse (1233441341), we get a palindrome (2664884662).

The spelling of 1431443321 in words is "one billion, four hundred thirty-one million, four hundred forty-three thousand, three hundred twenty-one".