85169447 has 4 divisors (see below), whose sum is σ = 92912136. Its totient is φ = 77426760.

The previous prime is 85169401. The next prime is 85169471. The reversal of 85169447 is 74496158.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85169447 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 85169398 and 85169407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85169477) 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 in 3 ways as a sum of consecutive naturals, for example, 3871328 + ... + 3871349.

It is an arithmetic number, because the mean of its divisors is an integer number (23228034).

Almost surely, 2^85169447 is an apocalyptic number.

85169447 is a deficient number, since it is larger than the sum of its proper divisors (7742689).

85169447 is a wasteful number, since it uses less digits than its factorization.

85169447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7742688.

The product of its digits is 241920, while the sum is 44.

The square root of 85169447 is about 9228.7294358433. The cubic root of 85169447 is about 439.9749417548.

Subtracting from 85169447 its reverse (74496158), we obtain a square (10673289 = 3267²).

The spelling of 85169447 in words is "eighty-five million, one hundred sixty-nine thousand, four hundred forty-seven".