212006749 has 2 divisors, whose sum is σ = 212006750. Its totient is φ = 212006748.

The previous prime is 212006741. The next prime is 212006761. The reversal of 212006749 is 947600212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118265625 + 93741124 = 10875^2 + 9682^2 .

It is a cyclic number.

It is not a de Polignac number, because 212006749 - 2³ = 212006741 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212006749.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212006741) 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, 106003374 + 106003375.

It is an arithmetic number, because the mean of its divisors is an integer number (106003375).

Almost surely, 2^212006749 is an apocalyptic number.

It is an amenable number.

212006749 is a deficient number, since it is larger than the sum of its proper divisors (1).

212006749 is an equidigital number, since it uses as much as digits as its factorization.

212006749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 212006749 is about 14560.4515383281. The cubic root of 212006749 is about 596.2795231409.

The spelling of 212006749 in words is "two hundred twelve million, six thousand, seven hundred forty-nine".