143132321 has 4 divisors (see below), whose sum is σ = 143193492. Its totient is φ = 143071152.

The previous prime is 143132309. The next prime is 143132329. The reversal of 143132321 is 123231341.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 123231341 = 157 ⋅784913.

It can be written as a sum of positive squares in 2 ways, for example, as 138768400 + 4363921 = 11780^2 + 2089^2 .

It is a cyclic number.

It is not a de Polignac number, because 143132321 - 2¹⁴ = 143115937 is a prime.

It is a super-2 number, since 2×143132321² = 40973722629694082, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 143132293 and 143132302.

It is not an unprimeable number, because it can be changed into a prime (143132329) 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, 26930 + ... + 31803.

It is an arithmetic number, because the mean of its divisors is an integer number (35798373).

Almost surely, 2^143132321 is an apocalyptic number.

It is an amenable number.

143132321 is a deficient number, since it is larger than the sum of its proper divisors (61171).

143132321 is an equidigital number, since it uses as much as digits as its factorization.

143132321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61170.

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

The square root of 143132321 is about 11963.7920827804. The cubic root of 143132321 is about 523.0933969376.

Adding to 143132321 its reverse (123231341), we get a palindrome (266363662).

The spelling of 143132321 in words is "one hundred forty-three million, one hundred thirty-two thousand, three hundred twenty-one".