85164559 has 2 divisors, whose sum is σ = 85164560. Its totient is φ = 85164558.

The previous prime is 85164539. The next prime is 85164581. The reversal of 85164559 is 95546158.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85164559 - 2¹³ = 85156367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85164539) 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, 42582279 + 42582280.

It is an arithmetic number, because the mean of its divisors is an integer number (42582280).

Almost surely, 2^85164559 is an apocalyptic number.

85164559 is a deficient number, since it is larger than the sum of its proper divisors (1).

85164559 is an equidigital number, since it uses as much as digits as its factorization.

85164559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216000, while the sum is 43.

The square root of 85164559 is about 9228.4646068563. The cubic root of 85164559 is about 439.9665246571.

The spelling of 85164559 in words is "eighty-five million, one hundred sixty-four thousand, five hundred fifty-nine".