211162109 has 2 divisors, whose sum is σ = 211162110. Its totient is φ = 211162108.

The previous prime is 211162069. The next prime is 211162139. The reversal of 211162109 is 901261112.

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., 211120900 + 41209 = 14530^2 + 203^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211162109 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211162139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105581054 + 105581055.

It is an arithmetic number, because the mean of its divisors is an integer number (105581055).

Almost surely, 2^211162109 is an apocalyptic number.

It is an amenable number.

211162109 is a deficient number, since it is larger than the sum of its proper divisors (1).

211162109 is an equidigital number, since it uses as much as digits as its factorization.

211162109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 211162109 is about 14531.4179968784. The cubic root of 211162109 is about 595.4866052061.

The spelling of 211162109 in words is "two hundred eleven million, one hundred sixty-two thousand, one hundred nine".