217049801389 has 2 divisors, whose sum is σ = 217049801390. Its totient is φ = 217049801388.

The previous prime is 217049801351. The next prime is 217049801393. The reversal of 217049801389 is 983108940712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212959175625 + 4090625764 = 461475^2 + 63958^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-217049801389 is a prime.

It is a super-2 number, since 2×217049801389² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217049801789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108524900694 + 108524900695.

It is an arithmetic number, because the mean of its divisors is an integer number (108524900695).

Almost surely, 2^217049801389 is an apocalyptic number.

It is an amenable number.

217049801389 is a deficient number, since it is larger than the sum of its proper divisors (1).

217049801389 is an equidigital number, since it uses as much as digits as its factorization.

217049801389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 52.

The spelling of 217049801389 in words is "two hundred seventeen billion, forty-nine million, eight hundred one thousand, three hundred eighty-nine".