143402231 has 4 divisors (see below), whose sum is σ = 163888272. Its totient is φ = 122916192.

The previous prime is 143402221. The next prime is 143402243. The reversal of 143402231 is 132204341.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132204341 = 349 ⋅378809.

It is not a de Polignac number, because 143402231 - 2¹⁰ = 143401207 is a prime.

It is a super-2 number, since 2×143402231² = 41128399711554722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (143402221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10243010 + ... + 10243023.

It is an arithmetic number, because the mean of its divisors is an integer number (40972068).

Almost surely, 2^143402231 is an apocalyptic number.

143402231 is a deficient number, since it is larger than the sum of its proper divisors (20486041).

143402231 is an equidigital number, since it uses as much as digits as its factorization.

143402231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20486040.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 143402231 is about 11975.0670561797. The cubic root of 143402231 is about 523.4219961031.

Adding to 143402231 its reverse (132204341), we get a palindrome (275606572).

The spelling of 143402231 in words is "one hundred forty-three million, four hundred two thousand, two hundred thirty-one".