211996789 has 2 divisors, whose sum is σ = 211996790. Its totient is φ = 211996788.

The previous prime is 211996787. The next prime is 211996847. The reversal of 211996789 is 987699112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156375025 + 55621764 = 12505^2 + 7458^2 .

It is a cyclic number.

It is not a de Polignac number, because 211996789 - 2¹ = 211996787 is a prime.

Together with 211996787, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211996787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105998394 + 105998395.

It is an arithmetic number, because the mean of its divisors is an integer number (105998395).

Almost surely, 2^211996789 is an apocalyptic number.

It is an amenable number.

211996789 is a deficient number, since it is larger than the sum of its proper divisors (1).

211996789 is an equidigital number, since it uses as much as digits as its factorization.

211996789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 52.

The square root of 211996789 is about 14560.1095119508. The cubic root of 211996789 is about 596.2701853296.

The spelling of 211996789 in words is "two hundred eleven million, nine hundred ninety-six thousand, seven hundred eighty-nine".