84458009 has 2 divisors, whose sum is σ = 84458010. Its totient is φ = 84458008.

The previous prime is 84457999. The next prime is 84458027. The reversal of 84458009 is 90085448.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44262409 + 40195600 = 6653^2 + 6340^2 .

It is a cyclic number.

It is not a de Polignac number, because 84458009 - 2⁸ = 84457753 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (84458029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42229004 + 42229005.

It is an arithmetic number, because the mean of its divisors is an integer number (42229005).

Almost surely, 2^84458009 is an apocalyptic number.

It is an amenable number.

84458009 is a deficient number, since it is larger than the sum of its proper divisors (1).

84458009 is an equidigital number, since it uses as much as digits as its factorization.

84458009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 84458009 is about 9190.1038623075. The cubic root of 84458009 is about 438.7464475380.

The spelling of 84458009 in words is "eighty-four million, four hundred fifty-eight thousand, nine".