211955069 has 2 divisors, whose sum is σ = 211955070. Its totient is φ = 211955068.

The previous prime is 211955063. The next prime is 211955077. The reversal of 211955069 is 960559112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209149444 + 2805625 = 14462^2 + 1675^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211955069 is a prime.

It is a super-2 number, since 2×211955069² = 89849902549589522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211955063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105977534 + 105977535.

It is an arithmetic number, because the mean of its divisors is an integer number (105977535).

Almost surely, 2^211955069 is an apocalyptic number.

It is an amenable number.

211955069 is a deficient number, since it is larger than the sum of its proper divisors (1).

211955069 is an equidigital number, since it uses as much as digits as its factorization.

211955069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24300, while the sum is 38.

The square root of 211955069 is about 14558.6767599257. The cubic root of 211955069 is about 596.2310683469.

The spelling of 211955069 in words is "two hundred eleven million, nine hundred fifty-five thousand, sixty-nine".