1143231321 has 4 divisors (see below), whose sum is σ = 1524308432. Its totient is φ = 762154212.

The previous prime is 1143231289. The next prime is 1143231329. The reversal of 1143231321 is 1231323411.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1231323411 = 3 ⋅410441137.

It is not a de Polignac number, because 1143231321 - 2⁵ = 1143231289 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 (1143231329) 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, 190538551 + ... + 190538556.

It is an arithmetic number, because the mean of its divisors is an integer number (381077108).

Almost surely, 2^1143231321 is an apocalyptic number.

It is an amenable number.

1143231321 is a deficient number, since it is larger than the sum of its proper divisors (381077111).

1143231321 is an equidigital number, since it uses as much as digits as its factorization.

1143231321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381077110.

The product of its digits is 432, while the sum is 21.

The square root of 1143231321 is about 33811.7039056005. The cubic root of 1143231321 is about 1045.6300073836.

Adding to 1143231321 its reverse (1231323411), we get a palindrome (2374554732).

The spelling of 1143231321 in words is "one billion, one hundred forty-three million, two hundred thirty-one thousand, three hundred twenty-one".