212299709 has 2 divisors, whose sum is σ = 212299710. Its totient is φ = 212299708.

The previous prime is 212299699. The next prime is 212299771. The reversal of 212299709 is 907992212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 207994084 + 4305625 = 14422^2 + 2075^2 .

It is a cyclic number.

It is not a de Polignac number, because 212299709 - 2⁴ = 212299693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212290709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106149854 + 106149855.

It is an arithmetic number, because the mean of its divisors is an integer number (106149855).

Almost surely, 2^212299709 is an apocalyptic number.

It is an amenable number.

212299709 is a deficient number, since it is larger than the sum of its proper divisors (1).

212299709 is an equidigital number, since it uses as much as digits as its factorization.

212299709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 212299709 is about 14570.5081929218. The cubic root of 212299709 is about 596.5540515836.

The spelling of 212299709 in words is "two hundred twelve million, two hundred ninety-nine thousand, seven hundred nine".