85478191 has 4 divisors (see below), whose sum is σ = 88235584. Its totient is φ = 82720800.

The previous prime is 85478161. The next prime is 85478203. The reversal of 85478191 is 19187458.

It is a happy number.

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 85478191 - 2¹¹ = 85476143 is a prime.

It is a super-2 number, since 2×85478191² = 14613042273264962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85478161) 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, 1378650 + ... + 1378711.

It is an arithmetic number, because the mean of its divisors is an integer number (22058896).

Almost surely, 2^85478191 is an apocalyptic number.

85478191 is a deficient number, since it is larger than the sum of its proper divisors (2757393).

85478191 is a wasteful number, since it uses less digits than its factorization.

85478191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2757392.

The product of its digits is 80640, while the sum is 43.

The square root of 85478191 is about 9245.4416335835. The cubic root of 85478191 is about 440.5059452069.

The spelling of 85478191 in words is "eighty-five million, four hundred seventy-eight thousand, one hundred ninety-one".