1788212788249 has 2 divisors, whose sum is σ = 1788212788250. Its totient is φ = 1788212788248.

The previous prime is 1788212788207. The next prime is 1788212788273. The reversal of 1788212788249 is 9428872128871.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1531265178249 + 256947610000 = 1237443^2 + 506900^2 .

It is a cyclic number.

It is not a de Polignac number, because 1788212788249 - 2⁹ = 1788212787737 is a prime.

It is not a weakly prime, because it can be changed into another prime (1788212788049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 894106394124 + 894106394125.

It is an arithmetic number, because the mean of its divisors is an integer number (894106394125).

Almost surely, 2^{1788212788249} is an apocalyptic number.

It is an amenable number.

1788212788249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1788212788249 is an equidigital number, since it uses as much as digits as its factorization.

1788212788249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 57802752, while the sum is 67.

The spelling of 1788212788249 in words is "one trillion, seven hundred eighty-eight billion, two hundred twelve million, seven hundred eighty-eight thousand, two hundred forty-nine".