143231321 has 4 divisors (see below), whose sum is σ = 143458944. Its totient is φ = 143003700.

The previous prime is 143231279. The next prime is 143231369. The reversal of 143231321 is 123132341.

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: 123132341 = 31 ⋅3972011.

It is a cyclic number.

It is not a de Polignac number, because 143231321 - 2¹⁴ = 143214937 is a prime.

It is a super-2 number, since 2×143231321² = 41030422630810082, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 143231293 and 143231302.

It is not an unprimeable number, because it can be changed into a prime (143231381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112865 + ... + 114126.

It is an arithmetic number, because the mean of its divisors is an integer number (35864736).

Almost surely, 2^143231321 is an apocalyptic number.

It is an amenable number.

143231321 is a deficient number, since it is larger than the sum of its proper divisors (227623).

143231321 is an equidigital number, since it uses as much as digits as its factorization.

143231321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227622.

The product of its digits is 432, while the sum is 20.

The square root of 143231321 is about 11967.9288517270. The cubic root of 143231321 is about 523.2139714076.

Adding to 143231321 its reverse (123132341), we get a palindrome (266363662).

The spelling of 143231321 in words is "one hundred forty-three million, two hundred thirty-one thousand, three hundred twenty-one".