231133143 has 4 divisors (see below), whose sum is σ = 308177528. Its totient is φ = 154088760.

The previous prime is 231133109. The next prime is 231133153. The reversal of 231133143 is 341331132.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 231133143 - 2⁹ = 231132631 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 (231133153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38522188 + ... + 38522193.

It is an arithmetic number, because the mean of its divisors is an integer number (77044382).

Almost surely, 2^231133143 is an apocalyptic number.

231133143 is a deficient number, since it is larger than the sum of its proper divisors (77044385).

231133143 is an equidigital number, since it uses as much as digits as its factorization.

231133143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77044384.

The product of its digits is 648, while the sum is 21.

The square root of 231133143 is about 15203.0636057342. The cubic root of 231133143 is about 613.6971055691.

Adding to 231133143 its reverse (341331132), we get a palindrome (572464275).

The spelling of 231133143 in words is "two hundred thirty-one million, one hundred thirty-three thousand, one hundred forty-three".