231331322011 has 4 divisors (see below), whose sum is σ = 231332653512. Its totient is φ = 231329990512.

The previous prime is 231331321997. The next prime is 231331322017. The reversal of 231331322011 is 110223133132.

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 231331322011 - 2¹³ = 231331313819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231331322017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 357601 + ... + 768466.

It is an arithmetic number, because the mean of its divisors is an integer number (57833163378).

Almost surely, 2^231331322011 is an apocalyptic number.

231331322011 is a deficient number, since it is larger than the sum of its proper divisors (1331501).

231331322011 is a wasteful number, since it uses less digits than its factorization.

231331322011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1331500.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 231331322011 its reverse (110223133132), we get a palindrome (341554455143).

The spelling of 231331322011 in words is "two hundred thirty-one billion, three hundred thirty-one million, three hundred twenty-two thousand, eleven".