85181773 has 4 divisors (see below), whose sum is σ = 85935708. Its totient is φ = 84427840.

The previous prime is 85181749. The next prime is 85181779. The reversal of 85181773 is 37718158.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18645124 + 66536649 = 4318^2 + 8157^2 .

It is a cyclic number.

It is not a de Polignac number, because 85181773 - 2⁵ = 85181741 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 (85181779) 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, 376798 + ... + 377023.

It is an arithmetic number, because the mean of its divisors is an integer number (21483927).

Almost surely, 2^85181773 is an apocalyptic number.

It is an amenable number.

85181773 is a deficient number, since it is larger than the sum of its proper divisors (753935).

85181773 is a wasteful number, since it uses less digits than its factorization.

85181773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 753934.

The product of its digits is 47040, while the sum is 40.

The square root of 85181773 is about 9229.3972175869. The cubic root of 85181773 is about 439.9961656002.

The spelling of 85181773 in words is "eighty-five million, one hundred eighty-one thousand, seven hundred seventy-three".