231222143 has 4 divisors (see below), whose sum is σ = 231276240. Its totient is φ = 231168048.

The previous prime is 231222127. The next prime is 231222179. The reversal of 231222143 is 341222132.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 231222143 - 2⁴ = 231222127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231228143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20030 + ... + 29387.

It is an arithmetic number, because the mean of its divisors is an integer number (57819060).

Almost surely, 2^231222143 is an apocalyptic number.

231222143 is a deficient number, since it is larger than the sum of its proper divisors (54097).

231222143 is an equidigital number, since it uses as much as digits as its factorization.

231222143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54096.

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

The square root of 231222143 is about 15205.9903656421. The cubic root of 231222143 is about 613.7758654168.

Adding to 231222143 its reverse (341222132), we get a palindrome (572444275).

The spelling of 231222143 in words is "two hundred thirty-one million, two hundred twenty-two thousand, one hundred forty-three".