43212089 has 2 divisors, whose sum is σ = 43212090. Its totient is φ = 43212088.

The previous prime is 43212083. The next prime is 43212097. The reversal of 43212089 is 98021234.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34164025 + 9048064 = 5845^2 + 3008^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43212089 is a prime.

It is equal to p_2616617 and since 43212089 and 2616617 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (43212083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21606044 + 21606045.

It is an arithmetic number, because the mean of its divisors is an integer number (21606045).

Almost surely, 2^43212089 is an apocalyptic number.

It is an amenable number.

43212089 is a deficient number, since it is larger than the sum of its proper divisors (1).

43212089 is an equidigital number, since it uses as much as digits as its factorization.

43212089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 43212089 is about 6573.5902671219. The cubic root of 43212089 is about 350.9148555797.

It can be divided in two parts, 432 and 12089, that added together give a palindrome (12521).

The spelling of 43212089 in words is "forty-three million, two hundred twelve thousand, eighty-nine".