231189143 has 4 divisors (see below), whose sum is σ = 231419280. Its totient is φ = 230959008.

The previous prime is 231189139. The next prime is 231189151. The reversal of 231189143 is 341981132.

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 231189143 - 2² = 231189139 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 (231189163) 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, 113555 + ... + 115572.

It is an arithmetic number, because the mean of its divisors is an integer number (57854820).

Almost surely, 2^231189143 is an apocalyptic number.

231189143 is a deficient number, since it is larger than the sum of its proper divisors (230137).

231189143 is a wasteful number, since it uses less digits than its factorization.

231189143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230136.

The product of its digits is 5184, while the sum is 32.

The square root of 231189143 is about 15204.9052282479. The cubic root of 231189143 is about 613.7466646852.

The spelling of 231189143 in words is "two hundred thirty-one million, one hundred eighty-nine thousand, one hundred forty-three".