231321005 has 32 divisors (see below), whose sum is σ = 298321920. Its totient is φ = 171800640.

The previous prime is 231321001. The next prime is 231321019. The reversal of 231321005 is 500123132.

It is not a de Polignac number, because 231321005 - 2² = 231321001 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231321001) 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 31 ways as a sum of consecutive naturals, for example, 698690 + ... + 699020.

It is an arithmetic number, because the mean of its divisors is an integer number (9322560).

Almost surely, 2^231321005 is an apocalyptic number.

It is an amenable number.

231321005 is a deficient number, since it is larger than the sum of its proper divisors (67000915).

231321005 is a wasteful number, since it uses less digits than its factorization.

231321005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 231321005 is about 15209.2407765805. The cubic root of 231321005 is about 613.8633288734.

Adding to 231321005 its reverse (500123132), we get a palindrome (731444137).

The spelling of 231321005 in words is "two hundred thirty-one million, three hundred twenty-one thousand, five".