85817197 has 4 divisors (see below), whose sum is σ = 85944636. Its totient is φ = 85689760.

The previous prime is 85817191. The next prime is 85817201. The reversal of 85817197 is 79171858.

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 85581001 + 236196 = 9251^2 + 486^2 .

It is a cyclic number.

It is not a de Polignac number, because 85817197 - 2¹⁵ = 85784429 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 (85817191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62704 + ... + 64057.

It is an arithmetic number, because the mean of its divisors is an integer number (21486159).

Almost surely, 2^85817197 is an apocalyptic number.

It is an amenable number.

85817197 is a deficient number, since it is larger than the sum of its proper divisors (127439).

85817197 is a wasteful number, since it uses less digits than its factorization.

85817197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127438.

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

The square root of 85817197 is about 9263.7571751423. The cubic root of 85817197 is about 441.0875250270.

The spelling of 85817197 in words is "eighty-five million, eight hundred seventeen thousand, one hundred ninety-seven".