2143531231 has 4 divisors (see below), whose sum is σ = 2148930952. Its totient is φ = 2138131512.

The previous prime is 2143531223. The next prime is 2143531283. The reversal of 2143531231 is 1321353412.

It is a happy number.

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 2143531231 - 2³ = 2143531223 is a prime.

It is a super-2 number, since 2×2143531231² = 9189452276544750722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2143531196 and 2143531205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2143531211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2699265 + ... + 2700058.

It is an arithmetic number, because the mean of its divisors is an integer number (537232738).

Almost surely, 2^2143531231 is an apocalyptic number.

2143531231 is a deficient number, since it is larger than the sum of its proper divisors (5399721).

2143531231 is an equidigital number, since it uses as much as digits as its factorization.

2143531231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5399720.

The product of its digits is 2160, while the sum is 25.

The square root of 2143531231 is about 46298.2854002176. The cubic root of 2143531231 is about 1289.3671617049.

Adding to 2143531231 its reverse (1321353412), we get a palindrome (3464884643).

The spelling of 2143531231 in words is "two billion, one hundred forty-three million, five hundred thirty-one thousand, two hundred thirty-one".