243143434091 has 2 divisors, whose sum is σ = 243143434092. Its totient is φ = 243143434090.

The previous prime is 243143434021. The next prime is 243143434129. The reversal of 243143434091 is 190434341342.

It is an a-pointer prime, because the next prime (243143434129) can be obtained adding 243143434091 to its sum of digits (38).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243143434091 is a prime.

It is not a weakly prime, because it can be changed into another prime (243143434021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121571717045 + 121571717046.

It is an arithmetic number, because the mean of its divisors is an integer number (121571717046).

Almost surely, 2^243143434091 is an apocalyptic number.

243143434091 is a deficient number, since it is larger than the sum of its proper divisors (1).

243143434091 is an equidigital number, since it uses as much as digits as its factorization.

243143434091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 38.

The spelling of 243143434091 in words is "two hundred forty-three billion, one hundred forty-three million, four hundred thirty-four thousand, ninety-one".