231213143 has 16 divisors (see below), whose sum is σ = 274294080. Its totient is φ = 190692096.

The previous prime is 231213137. The next prime is 231213149. The reversal of 231213143 is 341312132.

It is an interprime number because it is at equal distance from previous prime (231213137) and next prime (231213149).

It is not a de Polignac number, because 231213143 - 2⁴ = 231213127 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 (231213149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62555 + ... + 66147.

It is an arithmetic number, because the mean of its divisors is an integer number (17143380).

Almost surely, 2^231213143 is an apocalyptic number.

231213143 is a deficient number, since it is larger than the sum of its proper divisors (43080937).

231213143 is a wasteful number, since it uses less digits than its factorization.

231213143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3946.

The product of its digits is 432, while the sum is 20.

The square root of 231213143 is about 15205.6944267600. The cubic root of 231213143 is about 613.7679018564.

Adding to 231213143 its reverse (341312132), we get a palindrome (572525275).

The spelling of 231213143 in words is "two hundred thirty-one million, two hundred thirteen thousand, one hundred forty-three".