231211143 has 12 divisors (see below), whose sum is σ = 334262760. Its totient is φ = 154006416.

The previous prime is 231211109. The next prime is 231211153. The reversal of 231211143 is 341112132.

231211143 is nontrivially palindromic in base 6.

It is not a de Polignac number, because 231211143 - 2⁹ = 231210631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231211103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 328 + ... + 21506.

It is an arithmetic number, because the mean of its divisors is an integer number (27855230).

Almost surely, 2^231211143 is an apocalyptic number.

231211143 is a deficient number, since it is larger than the sum of its proper divisors (103051617).

231211143 is a wasteful number, since it uses less digits than its factorization.

231211143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22398 (or 22395 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 231211143 is about 15205.6286617818. The cubic root of 231211143 is about 613.7661321483.

Adding to 231211143 its reverse (341112132), we get a palindrome (572323275).

The spelling of 231211143 in words is "two hundred thirty-one million, two hundred eleven thousand, one hundred forty-three".