212091161 has 2 divisors, whose sum is σ = 212091162. Its totient is φ = 212091160.

The previous prime is 212091151. The next prime is 212091203. The reversal of 212091161 is 161190212.

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., 208975936 + 3115225 = 14456^2 + 1765^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212091161 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (212091151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106045580 + 106045581.

It is an arithmetic number, because the mean of its divisors is an integer number (106045581).

Almost surely, 2^212091161 is an apocalyptic number.

It is an amenable number.

212091161 is a deficient number, since it is larger than the sum of its proper divisors (1).

212091161 is an equidigital number, since it uses as much as digits as its factorization.

212091161 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 212091161 is about 14563.3499236954. The cubic root of 212091161 is about 596.3586502892.

The spelling of 212091161 in words is "two hundred twelve million, ninety-one thousand, one hundred sixty-one".