85521177 has 28 divisors (see below), whose sum is σ = 146549440. Its totient is φ = 48866328.

The previous prime is 85521173. The next prime is 85521217. The reversal of 85521177 is 77112558.

It is not a de Polignac number, because 85521177 - 2² = 85521173 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85521173) 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 27 ways as a sum of consecutive naturals, for example, 3277 + ... + 13482.

Almost surely, 2^85521177 is an apocalyptic number.

It is an amenable number.

85521177 is a deficient number, since it is larger than the sum of its proper divisors (61028263).

85521177 is an equidigital number, since it uses as much as digits as its factorization.

85521177 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16784 (or 16769 counting only the distinct ones).

The product of its digits is 19600, while the sum is 36.

The square root of 85521177 is about 9247.7660545669. The cubic root of 85521177 is about 440.5797746249.

The spelling of 85521177 in words is "eighty-five million, five hundred twenty-one thousand, one hundred seventy-seven".