243343042091 has 2 divisors, whose sum is σ = 243343042092. Its totient is φ = 243343042090.

The previous prime is 243343042079. The next prime is 243343042097. The reversal of 243343042091 is 190240343342.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243343042091 is a prime.

It is a super-2 number, since 2×243343042091² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (243343042097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121671521045 + 121671521046.

It is an arithmetic number, because the mean of its divisors is an integer number (121671521046).

Almost surely, 2^243343042091 is an apocalyptic number.

243343042091 is a deficient number, since it is larger than the sum of its proper divisors (1).

243343042091 is an equidigital number, since it uses as much as digits as its factorization.

243343042091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 35.

The spelling of 243343042091 in words is "two hundred forty-three billion, three hundred forty-three million, forty-two thousand, ninety-one".