212343191 has 4 divisors (see below), whose sum is σ = 219665400. Its totient is φ = 205020984.

The previous prime is 212343169. The next prime is 212343217. The reversal of 212343191 is 191343212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 212343191 - 2⁶ = 212343127 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212343191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212343101) 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 in 3 ways as a sum of consecutive naturals, for example, 3661061 + ... + 3661118.

It is an arithmetic number, because the mean of its divisors is an integer number (54916350).

Almost surely, 2^212343191 is an apocalyptic number.

212343191 is a deficient number, since it is larger than the sum of its proper divisors (7322209).

212343191 is an equidigital number, since it uses as much as digits as its factorization.

212343191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7322208.

The product of its digits is 1296, while the sum is 26.

The square root of 212343191 is about 14572.0002401867. Note that the first 3 decimals coincide. The cubic root of 212343191 is about 596.5947763883.

The spelling of 212343191 in words is "two hundred twelve million, three hundred forty-three thousand, one hundred ninety-one".