212791171 has 2 divisors, whose sum is σ = 212791172. Its totient is φ = 212791170.

The previous prime is 212791141. The next prime is 212791213. The reversal of 212791171 is 171197212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212791171 - 2¹³ = 212782979 is a prime.

It is not a weakly prime, because it can be changed into another prime (212791141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106395585 + 106395586.

It is an arithmetic number, because the mean of its divisors is an integer number (106395586).

Almost surely, 2^212791171 is an apocalyptic number.

212791171 is a deficient number, since it is larger than the sum of its proper divisors (1).

212791171 is an equidigital number, since it uses as much as digits as its factorization.

212791171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1764, while the sum is 31.

The square root of 212791171 is about 14587.3634012456. The cubic root of 212791171 is about 597.0140266264.

The spelling of 212791171 in words is "two hundred twelve million, seven hundred ninety-one thousand, one hundred seventy-one".