84522409 has 2 divisors, whose sum is σ = 84522410. Its totient is φ = 84522408.

The previous prime is 84522377. The next prime is 84522421. The reversal of 84522409 is 90422548.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82355625 + 2166784 = 9075^2 + 1472^2 .

It is a cyclic number.

It is not a de Polignac number, because 84522409 - 2⁵ = 84522377 is a prime.

It is not a weakly prime, because it can be changed into another prime (84522209) 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, 42261204 + 42261205.

It is an arithmetic number, because the mean of its divisors is an integer number (42261205).

Almost surely, 2^84522409 is an apocalyptic number.

It is an amenable number.

84522409 is a deficient number, since it is larger than the sum of its proper divisors (1).

84522409 is an equidigital number, since it uses as much as digits as its factorization.

84522409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 84522409 is about 9193.6069635372. The cubic root of 84522409 is about 438.8579352582.

The spelling of 84522409 in words is "eighty-four million, five hundred twenty-two thousand, four hundred nine".