231131440243 has 4 divisors (see below), whose sum is σ = 252143389368. Its totient is φ = 210119491120.

The previous prime is 231131440193. The next prime is 231131440259. The reversal of 231131440243 is 342044131132.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-231131440243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231131440283) 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, 10505974546 + ... + 10505974567.

It is an arithmetic number, because the mean of its divisors is an integer number (63035847342).

Almost surely, 2^231131440243 is an apocalyptic number.

231131440243 is a deficient number, since it is larger than the sum of its proper divisors (21011949125).

231131440243 is a wasteful number, since it uses less digits than its factorization.

231131440243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21011949124.

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 231131440243 its reverse (342044131132), we get a palindrome (573175571375).

The spelling of 231131440243 in words is "two hundred thirty-one billion, one hundred thirty-one million, four hundred forty thousand, two hundred forty-three".