212043989 has 2 divisors, whose sum is σ = 212043990. Its totient is φ = 212043988.

The previous prime is 212043983. The next prime is 212044031. The reversal of 212043989 is 989340212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209033764 + 3010225 = 14458^2 + 1735^2 .

It is a cyclic number.

It is not a de Polignac number, because 212043989 - 2⁴ = 212043973 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212043983) 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, 106021994 + 106021995.

It is an arithmetic number, because the mean of its divisors is an integer number (106021995).

Almost surely, 2^212043989 is an apocalyptic number.

It is an amenable number.

212043989 is a deficient number, since it is larger than the sum of its proper divisors (1).

212043989 is an equidigital number, since it uses as much as digits as its factorization.

212043989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 212043989 is about 14561.7302886711. The cubic root of 212043989 is about 596.3144342141.

The spelling of 212043989 in words is "two hundred twelve million, forty-three thousand, nine hundred eighty-nine".