231434143 has 4 divisors (see below), whose sum is σ = 233820160. Its totient is φ = 229048128.

The previous prime is 231434131. The next prime is 231434179. The reversal of 231434143 is 341434132.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231434143 is a prime.

It is a super-2 number, since 2×231434143² = 107123525092288898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231434113) 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, 1192863 + ... + 1193056.

It is an arithmetic number, because the mean of its divisors is an integer number (58455040).

Almost surely, 2^231434143 is an apocalyptic number.

231434143 is a deficient number, since it is larger than the sum of its proper divisors (2386017).

231434143 is an equidigital number, since it uses as much as digits as its factorization.

231434143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2386016.

The product of its digits is 3456, while the sum is 25.

The square root of 231434143 is about 15212.9597054617. The cubic root of 231434143 is about 613.9633917703.

Adding to 231434143 its reverse (341434132), we get a palindrome (572868275).

The spelling of 231434143 in words is "two hundred thirty-one million, four hundred thirty-four thousand, one hundred forty-three".