85177891 has 4 divisors (see below), whose sum is σ = 85553352. Its totient is φ = 84802432.

The previous prime is 85177877. The next prime is 85177909. The reversal of 85177891 is 19877158.

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

It is a cyclic number.

It is not a de Polignac number, because 85177891 - 2¹¹ = 85175843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85177831) 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, 187390 + ... + 187843.

It is an arithmetic number, because the mean of its divisors is an integer number (21388338).

Almost surely, 2^85177891 is an apocalyptic number.

85177891 is a deficient number, since it is larger than the sum of its proper divisors (375461).

85177891 is a wasteful number, since it uses less digits than its factorization.

85177891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375460.

The product of its digits is 141120, while the sum is 46.

The square root of 85177891 is about 9229.1869089319. The cubic root of 85177891 is about 439.9894814979.

It can be divided in two parts, 85177 and 891, that added together give a palindrome (86068).

The spelling of 85177891 in words is "eighty-five million, one hundred seventy-seven thousand, eight hundred ninety-one".