2117787290789 has 2 divisors, whose sum is σ = 2117787290790. Its totient is φ = 2117787290788.

The previous prime is 2117787290777. The next prime is 2117787290803. The reversal of 2117787290789 is 9870927877112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1796717733889 + 321069556900 = 1340417^2 + 566630^2 .

It is a cyclic number.

It is not a de Polignac number, because 2117787290789 - 2⁸ = 2117787290533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2117787290389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1058893645394 + 1058893645395.

It is an arithmetic number, because the mean of its divisors is an integer number (1058893645395).

Almost surely, 2^{2117787290789} is an apocalyptic number.

It is an amenable number.

2117787290789 is a deficient number, since it is larger than the sum of its proper divisors (1).

2117787290789 is an equidigital number, since it uses as much as digits as its factorization.

2117787290789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 49787136, while the sum is 68.

The spelling of 2117787290789 in words is "two trillion, one hundred seventeen billion, seven hundred eighty-seven million, two hundred ninety thousand, seven hundred eighty-nine".