212091799 has 2 divisors, whose sum is σ = 212091800. Its totient is φ = 212091798.

The previous prime is 212091797. The next prime is 212091821. The reversal of 212091799 is 997190212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212091799 - 2¹ = 212091797 is a prime.

Together with 212091797, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212091793) 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, 106045899 + 106045900.

It is an arithmetic number, because the mean of its divisors is an integer number (106045900).

Almost surely, 2^212091799 is an apocalyptic number.

212091799 is a deficient number, since it is larger than the sum of its proper divisors (1).

212091799 is an equidigital number, since it uses as much as digits as its factorization.

212091799 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20412, while the sum is 40.

The square root of 212091799 is about 14563.3718279799. The cubic root of 212091799 is about 596.3592482654.

The spelling of 212091799 in words is "two hundred twelve million, ninety-one thousand, seven hundred ninety-nine".