231310321 has 4 divisors (see below), whose sum is σ = 252338544. Its totient is φ = 210282100.

The previous prime is 231310319. The next prime is 231310327. The reversal of 231310321 is 123013132.

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 a cyclic number.

It is not a de Polignac number, because 231310321 - 2¹ = 231310319 is a prime.

It is a super-2 number, since 2×231310321² = 107008929202246082, 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 = 231310295 and 231310304.

It is not an unprimeable number, because it can be changed into a prime (231310327) 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, 10514095 + ... + 10514116.

It is an arithmetic number, because the mean of its divisors is an integer number (63084636).

Almost surely, 2^231310321 is an apocalyptic number.

It is an amenable number.

231310321 is a deficient number, since it is larger than the sum of its proper divisors (21028223).

231310321 is a wasteful number, since it uses less digits than its factorization.

231310321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21028222.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 231310321 is about 15208.8895386876. The cubic root of 231310321 is about 613.8538779133.

Adding to 231310321 its reverse (123013132), we get a palindrome (354323453).

The spelling of 231310321 in words is "two hundred thirty-one million, three hundred ten thousand, three hundred twenty-one".