211009969 has 2 divisors, whose sum is σ = 211009970. Its totient is φ = 211009968.

The previous prime is 211009961. The next prime is 211009973. The reversal of 211009969 is 969900112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 203918400 + 7091569 = 14280^2 + 2663^2 .

It is a cyclic number.

It is not a de Polignac number, because 211009969 - 2³ = 211009961 is a prime.

It is a super-2 number, since 2×211009969² = 89050414034761922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (211009961) 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, 105504984 + 105504985.

It is an arithmetic number, because the mean of its divisors is an integer number (105504985).

Almost surely, 2^211009969 is an apocalyptic number.

It is an amenable number.

211009969 is a deficient number, since it is larger than the sum of its proper divisors (1).

211009969 is an equidigital number, since it uses as much as digits as its factorization.

211009969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8748, while the sum is 37.

The square root of 211009969 is about 14526.1821894123. The cubic root of 211009969 is about 595.3435569742.

The spelling of 211009969 in words is "two hundred eleven million, nine thousand, nine hundred sixty-nine".