212869 has 2 divisors, whose sum is σ = 212870. Its totient is φ = 212868.

The previous prime is 212867. The next prime is 212873. The reversal of 212869 is 968212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 191844 + 21025 = 438^2 + 145^2 .

It is a cyclic number.

It is not a de Polignac number, because 212869 - 2¹ = 212867 is a prime.

It is a super-3 number, since 3×212869³ = 28937333839892727, which contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 212867, it forms a pair of twin primes.

It is a Chen prime.

212869 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106434 + 106435.

It is an arithmetic number, because the mean of its divisors is an integer number (106435).

2²¹²⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

212869 is a deficient number, since it is larger than the sum of its proper divisors (1).

212869 is an equidigital number, since it uses as much as digits as its factorization.

212869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 28.

The square root of 212869 is about 461.3772859602. The cubic root of 212869 is about 59.7086804303.

It can be divided in two parts, 2128 and 69, that added together give a cube (2197 = 13³).

The spelling of 212869 in words is "two hundred twelve thousand, eight hundred sixty-nine".