231031311 has 8 divisors (see below), whose sum is σ = 352047744. Its totient is φ = 132017880.

The previous prime is 231031301. The next prime is 231031319. The reversal of 231031311 is 113130132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 231031311 - 2¹⁰ = 231030287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231031319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5500725 + ... + 5500766.

It is an arithmetic number, because the mean of its divisors is an integer number (44005968).

Almost surely, 2^231031311 is an apocalyptic number.

231031311 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

231031311 is a deficient number, since it is larger than the sum of its proper divisors (121016433).

231031311 is a wasteful number, since it uses less digits than its factorization.

231031311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11001501.

The product of its (nonzero) digits is 54, while the sum is 15.

The square root of 231031311 is about 15199.7141749442. The cubic root of 231031311 is about 613.6069653396.

Adding to 231031311 its reverse (113130132), we get a palindrome (344161443).

The spelling of 231031311 in words is "two hundred thirty-one million, thirty-one thousand, three hundred eleven".