231131433443 has 4 divisors (see below), whose sum is σ = 232030777800. Its totient is φ = 230232089088.

The previous prime is 231131433427. The next prime is 231131433461. The reversal of 231131433443 is 344334131132.

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 231131433443 - 2⁴ = 231131433427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231131433343) 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, 449671793 + ... + 449672306.

It is an arithmetic number, because the mean of its divisors is an integer number (58007694450).

Almost surely, 2^231131433443 is an apocalyptic number.

231131433443 is a deficient number, since it is larger than the sum of its proper divisors (899344357).

231131433443 is an equidigital number, since it uses as much as digits as its factorization.

231131433443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 899344356.

The product of its digits is 31104, while the sum is 32.

Adding to 231131433443 its reverse (344334131132), we get a palindrome (575465564575).

The spelling of 231131433443 in words is "two hundred thirty-one billion, one hundred thirty-one million, four hundred thirty-three thousand, four hundred forty-three".