211978456589 has 2 divisors, whose sum is σ = 211978456590. Its totient is φ = 211978456588.

The previous prime is 211978456577. The next prime is 211978456603. The reversal of 211978456589 is 985654879112.

211978456589 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., 210318546025 + 1659910564 = 458605^2 + 40742^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211978456589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211978456519) 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, 105989228294 + 105989228295.

It is an arithmetic number, because the mean of its divisors is an integer number (105989228295).

Almost surely, 2^211978456589 is an apocalyptic number.

It is an amenable number.

211978456589 is a deficient number, since it is larger than the sum of its proper divisors (1).

211978456589 is an equidigital number, since it uses as much as digits as its factorization.

211978456589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43545600, while the sum is 65.

The spelling of 211978456589 in words is "two hundred eleven billion, nine hundred seventy-eight million, four hundred fifty-six thousand, five hundred eighty-nine".