938587949786917 has 2 divisors, whose sum is σ = 938587949786918. Its totient is φ = 938587949786916.

The previous prime is 938587949786791. The next prime is 938587949786999. The reversal of 938587949786917 is 719687949785839.

Together with previous prime (938587949786791) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 539391985334596 + 399195964452321 = 23224814^2 + 19979889^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-938587949786917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (938587949786017) 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, 469293974893458 + 469293974893459.

It is an arithmetic number, because the mean of its divisors is an integer number (469293974893459).

Almost surely, 2^{938587949786917} is an apocalyptic number.

It is an amenable number.

938587949786917 is a deficient number, since it is larger than the sum of its proper divisors (1).

938587949786917 is an equidigital number, since it uses as much as digits as its factorization.

938587949786917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 414797967360, while the sum is 100.

The spelling of 938587949786917 in words is "nine hundred thirty-eight trillion, five hundred eighty-seven billion, nine hundred forty-nine million, seven hundred eighty-six thousand, nine hundred seventeen".