243219948091 has 2 divisors, whose sum is σ = 243219948092. Its totient is φ = 243219948090.

The previous prime is 243219948067. The next prime is 243219948133. The reversal of 243219948091 is 190849912342.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243219948091 is a prime.

It is not a weakly prime, because it can be changed into another prime (243219945091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121609974045 + 121609974046.

It is an arithmetic number, because the mean of its divisors is an integer number (121609974046).

Almost surely, 2^243219948091 is an apocalyptic number.

243219948091 is a deficient number, since it is larger than the sum of its proper divisors (1).

243219948091 is an equidigital number, since it uses as much as digits as its factorization.

243219948091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1119744, while the sum is 52.

The spelling of 243219948091 in words is "two hundred forty-three billion, two hundred nineteen million, nine hundred forty-eight thousand, ninety-one".