85399169 has 2 divisors, whose sum is σ = 85399170. Its totient is φ = 85399168.

The previous prime is 85399163. The next prime is 85399183. The reversal of 85399169 is 96199358.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75082225 + 10316944 = 8665^2 + 3212^2 .

It is a cyclic number.

It is not a de Polignac number, because 85399169 - 2⁸ = 85398913 is a prime.

It is a super-2 number, since 2×85399169² = 14586036131781122, which contains 22 as substring.

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 (85399163) 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, 42699584 + 42699585.

It is an arithmetic number, because the mean of its divisors is an integer number (42699585).

Almost surely, 2^85399169 is an apocalyptic number.

It is an amenable number.

85399169 is a deficient number, since it is larger than the sum of its proper divisors (1).

85399169 is an equidigital number, since it uses as much as digits as its factorization.

85399169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 524880, while the sum is 50.

The square root of 85399169 is about 9241.1670799743. The cubic root of 85399169 is about 440.3701585509.

The spelling of 85399169 in words is "eighty-five million, three hundred ninety-nine thousand, one hundred sixty-nine".