231142321 has 4 divisors (see below), whose sum is σ = 231198052. Its totient is φ = 231086592.

The previous prime is 231142259. The next prime is 231142339. The reversal of 231142321 is 123241132.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 22657600 + 208484721 = 4760^2 + 14439^2 .

It is a cyclic number.

It is not a de Polignac number, because 231142321 - 2¹³ = 231134129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231142361) 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, 21096 + ... + 30121.

It is an arithmetic number, because the mean of its divisors is an integer number (57799513).

Almost surely, 2^231142321 is an apocalyptic number.

It is an amenable number.

231142321 is a deficient number, since it is larger than the sum of its proper divisors (55731).

231142321 is an equidigital number, since it uses as much as digits as its factorization.

231142321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55730.

The product of its digits is 288, while the sum is 19.

The square root of 231142321 is about 15203.3654497943. The cubic root of 231142321 is about 613.7052285027.

Adding to 231142321 its reverse (123241132), we get a palindrome (354383453).

The spelling of 231142321 in words is "two hundred thirty-one million, one hundred forty-two thousand, three hundred twenty-one".