212440289 has 2 divisors, whose sum is σ = 212440290. Its totient is φ = 212440288.

The previous prime is 212440231. The next prime is 212440301. The reversal of 212440289 is 982044212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 206870689 + 5569600 = 14383^2 + 2360^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212440289 is a prime.

It is equal to p_11728751 and since 212440289 and 11728751 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (212440219) 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, 106220144 + 106220145.

It is an arithmetic number, because the mean of its divisors is an integer number (106220145).

Almost surely, 2^212440289 is an apocalyptic number.

It is an amenable number.

212440289 is a deficient number, since it is larger than the sum of its proper divisors (1).

212440289 is an equidigital number, since it uses as much as digits as its factorization.

212440289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 212440289 is about 14575.3315228162. The cubic root of 212440289 is about 596.6856973356.

The spelling of 212440289 in words is "two hundred twelve million, four hundred forty thousand, two hundred eighty-nine".