231318143 has 4 divisors (see below), whose sum is σ = 264363600. Its totient is φ = 198272688.

The previous prime is 231318091. The next prime is 231318149. The reversal of 231318143 is 341813132.

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 231318143 - 2⁶ = 231318079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231318149) 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 3 ways as a sum of consecutive naturals, for example, 16522718 + ... + 16522731.

It is an arithmetic number, because the mean of its divisors is an integer number (66090900).

Almost surely, 2^231318143 is an apocalyptic number.

231318143 is a deficient number, since it is larger than the sum of its proper divisors (33045457).

231318143 is an equidigital number, since it uses as much as digits as its factorization.

231318143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33045456.

The product of its digits is 1728, while the sum is 26.

The square root of 231318143 is about 15209.1466887528. The cubic root of 231318143 is about 613.8607972052.

The spelling of 231318143 in words is "two hundred thirty-one million, three hundred eighteen thousand, one hundred forty-three".