687100108789 has 2 divisors, whose sum is σ = 687100108790. Its totient is φ = 687100108788.

The previous prime is 687100108699. The next prime is 687100108817. The reversal of 687100108789 is 987801001786.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 359240800689 + 327859308100 = 599367^2 + 572590^2 .

It is a cyclic number.

It is not a de Polignac number, because 687100108789 - 2¹³ = 687100100597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687100108489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343550054394 + 343550054395.

It is an arithmetic number, because the mean of its divisors is an integer number (343550054395).

Almost surely, 2^687100108789 is an apocalyptic number.

It is an amenable number.

687100108789 is a deficient number, since it is larger than the sum of its proper divisors (1).

687100108789 is an equidigital number, since it uses as much as digits as its factorization.

687100108789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1354752, while the sum is 55.

The spelling of 687100108789 in words is "six hundred eighty-seven billion, one hundred million, one hundred eight thousand, seven hundred eighty-nine".