19943081233 has 2 divisors, whose sum is σ = 19943081234. Its totient is φ = 19943081232.

The previous prime is 19943081173. The next prime is 19943081237. The reversal of 19943081233 is 33218034991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18920552704 + 1022528529 = 137552^2 + 31977^2 .

It is a cyclic number.

It is not a de Polignac number, because 19943081233 - 2³³ = 11353146641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19943081233.

It is not a weakly prime, because it can be changed into another prime (19943081237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9971540616 + 9971540617.

It is an arithmetic number, because the mean of its divisors is an integer number (9971540617).

Almost surely, 2^19943081233 is an apocalyptic number.

It is an amenable number.

19943081233 is a deficient number, since it is larger than the sum of its proper divisors (1).

19943081233 is an equidigital number, since it uses as much as digits as its factorization.

19943081233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 43.

The spelling of 19943081233 in words is "nineteen billion, nine hundred forty-three million, eighty-one thousand, two hundred thirty-three".