2143643231 has 4 divisors (see below), whose sum is σ = 2167729200. Its totient is φ = 2119557264.

The previous prime is 2143643219. The next prime is 2143643297. The reversal of 2143643231 is 1323463412.

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-2143643231 is a prime.

It is a super-2 number, since 2×2143643231² = 9190412603624238722, 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 = 2143643194 and 2143643203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2143643731) 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, 12042851 + ... + 12043028.

It is an arithmetic number, because the mean of its divisors is an integer number (541932300).

Almost surely, 2^2143643231 is an apocalyptic number.

2143643231 is a deficient number, since it is larger than the sum of its proper divisors (24085969).

2143643231 is an equidigital number, since it uses as much as digits as its factorization.

2143643231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24085968.

The product of its digits is 10368, while the sum is 29.

The square root of 2143643231 is about 46299.4949324504. The cubic root of 2143643231 is about 1289.3896178907.

The spelling of 2143643231 in words is "two billion, one hundred forty-three million, six hundred forty-three thousand, two hundred thirty-one".