231144321 has 4 divisors (see below), whose sum is σ = 308192432. Its totient is φ = 154096212.

The previous prime is 231144313. The next prime is 231144341. The reversal of 231144321 is 123441132.

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.

It is not a de Polignac number, because 231144321 - 2³ = 231144313 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (231144341) 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, 38524051 + ... + 38524056.

It is an arithmetic number, because the mean of its divisors is an integer number (77048108).

Almost surely, 2^231144321 is an apocalyptic number.

It is an amenable number.

231144321 is a deficient number, since it is larger than the sum of its proper divisors (77048111).

231144321 is an equidigital number, since it uses as much as digits as its factorization.

231144321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77048110.

The product of its digits is 576, while the sum is 21.

The square root of 231144321 is about 15203.4312245624. The cubic root of 231144321 is about 613.7069985621.

Adding to 231144321 its reverse (123441132), we get a palindrome (354585453).

The spelling of 231144321 in words is "two hundred thirty-one million, one hundred forty-four thousand, three hundred twenty-one".