85906169 has 2 divisors, whose sum is σ = 85906170. Its totient is φ = 85906168.

The previous prime is 85906159. The next prime is 85906189. The reversal of 85906169 is 96160958.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85285225 + 620944 = 9235^2 + 788^2 .

It is a cyclic number.

It is not a de Polignac number, because 85906169 - 2⁴ = 85906153 is a prime.

It is a super-2 number, since 2×85906169² = 14759739744513122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (85906109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42953084 + 42953085.

It is an arithmetic number, because the mean of its divisors is an integer number (42953085).

Almost surely, 2^85906169 is an apocalyptic number.

It is an amenable number.

85906169 is a deficient number, since it is larger than the sum of its proper divisors (1).

85906169 is an equidigital number, since it uses as much as digits as its factorization.

85906169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 85906169 is about 9268.5580863476. The cubic root of 85906169 is about 441.2399066244.

The spelling of 85906169 in words is "eighty-five million, nine hundred six thousand, one hundred sixty-nine".