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211986745781 is a prime number
BaseRepresentation
bin1100010101101101100…
…1010000100110110101
3202021011201110110110212
43011123121100212311
511433122101331111
6241215123355205
721213141415466
oct3053331204665
9667151413425
10211986745781
11819a2a9a778
1235101b22b05
1316cb47c2b65
14a39004cd6d
1557aa97798b
hex315b6509b5

211986745781 has 2 divisors, whose sum is σ = 211986745782. Its totient is φ = 211986745780.

The previous prime is 211986745777. The next prime is 211986745787. The reversal of 211986745781 is 187547689112.

It is a happy number.

211986745781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197483360881 + 14503384900 = 444391^2 + 120430^2 .

It is a cyclic number.

It is not a de Polignac number, because 211986745781 - 22 = 211986745777 is a prime.

It is a super-2 number, since 2×2119867457812 (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 211986745781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211986745787) 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, 105993372890 + 105993372891.

It is an arithmetic number, because the mean of its divisors is an integer number (105993372891).

Almost surely, 2211986745781 is an apocalyptic number.

It is an amenable number.

211986745781 is a deficient number, since it is larger than the sum of its proper divisors (1).

211986745781 is an equidigital number, since it uses as much as digits as its factorization.

211986745781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6773760, while the sum is 59.

The spelling of 211986745781 in words is "two hundred eleven billion, nine hundred eighty-six million, seven hundred forty-five thousand, seven hundred eighty-one".