19434250243 has 2 divisors, whose sum is σ = 19434250244. Its totient is φ = 19434250242.

The previous prime is 19434250237. The next prime is 19434250267. The reversal of 19434250243 is 34205243491.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19434250243 is a prime.

It is not a weakly prime, because it can be changed into another prime (19734250243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9717125121 + 9717125122.

It is an arithmetic number, because the mean of its divisors is an integer number (9717125122).

Almost surely, 2^19434250243 is an apocalyptic number.

19434250243 is a deficient number, since it is larger than the sum of its proper divisors (1).

19434250243 is an equidigital number, since it uses as much as digits as its factorization.

19434250243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 37.

The spelling of 19434250243 in words is "nineteen billion, four hundred thirty-four million, two hundred fifty thousand, two hundred forty-three".