8209855197 has 20 divisors (see below), whose sum is σ = 12271095936. Its totient is φ = 5470116840.

The previous prime is 8209855189. The next prime is 8209855207. The reversal of 8209855197 is 7915589028.

8209855197 is a `hidden beast` number, since 82 + 0 + 9 + 8 + 551 + 9 + 7 = 666.

It is not a de Polignac number, because 8209855197 - 2³ = 8209855189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8209855127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 118708 + ... + 174674.

Almost surely, 2^8209855197 is an apocalyptic number.

It is an amenable number.

8209855197 is a deficient number, since it is larger than the sum of its proper divisors (4061240739).

8209855197 is a wasteful number, since it uses less digits than its factorization.

8209855197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57790 (or 57781 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 54.

The square root of 8209855197 is about 90608.2512633369. The cubic root of 8209855197 is about 2017.3372094019.

The spelling of 8209855197 in words is "eight billion, two hundred nine million, eight hundred fifty-five thousand, one hundred ninety-seven".