8197191 has 6 divisors (see below), whose sum is σ = 11840400. Its totient is φ = 5464788.

The previous prime is 8197183. The next prime is 8197193. The reversal of 8197191 is 1917918.

It is not a de Polignac number, because 8197191 - 2³ = 8197183 is a prime.

8197191 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8197193) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 455391 + ... + 455408.

It is an arithmetic number, because the mean of its divisors is an integer number (1973400).

Almost surely, 2^8197191 is an apocalyptic number.

8197191 is a deficient number, since it is larger than the sum of its proper divisors (3643209).

8197191 is a wasteful number, since it uses less digits than its factorization.

8197191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910805 (or 910802 counting only the distinct ones).

The product of its digits is 4536, while the sum is 36.

The square root of 8197191 is about 2863.0736979687. The cubic root of 8197191 is about 201.6299387463.

The spelling of 8197191 in words is "eight million, one hundred ninety-seven thousand, one hundred ninety-one".