85117447 has 4 divisors (see below), whose sum is σ = 85960296. Its totient is φ = 84274600.

The previous prime is 85117433. The next prime is 85117477. The reversal of 85117447 is 74471158.

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-85117447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85117477) 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 in 3 ways as a sum of consecutive naturals, for example, 421273 + ... + 421474.

It is an arithmetic number, because the mean of its divisors is an integer number (21490074).

Almost surely, 2^85117447 is an apocalyptic number.

85117447 is a deficient number, since it is larger than the sum of its proper divisors (842849).

85117447 is a wasteful number, since it uses less digits than its factorization.

85117447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 842848.

The product of its digits is 31360, while the sum is 37.

The square root of 85117447 is about 9225.9117164647. The cubic root of 85117447 is about 439.8853816463.

The spelling of 85117447 in words is "eighty-five million, one hundred seventeen thousand, four hundred forty-seven".