43212989 has 2 divisors, whose sum is σ = 43212990. Its totient is φ = 43212988.

The previous prime is 43212959. The next prime is 43212991. The reversal of 43212989 is 98921234.

43212989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42680089 + 532900 = 6533^2 + 730^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43212989 is a prime.

Together with 43212991, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43212919) 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, 21606494 + 21606495.

It is an arithmetic number, because the mean of its divisors is an integer number (21606495).

Almost surely, 2^43212989 is an apocalyptic number.

It is an amenable number.

43212989 is a deficient number, since it is larger than the sum of its proper divisors (1).

43212989 is an equidigital number, since it uses as much as digits as its factorization.

43212989 is an odious number, because the sum of its binary digits is odd.

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

The square root of 43212989 is about 6573.6587225076. The cubic root of 43212989 is about 350.9172917897.

The spelling of 43212989 in words is "forty-three million, two hundred twelve thousand, nine hundred eighty-nine".