8191189 has 2 divisors, whose sum is σ = 8191190. Its totient is φ = 8191188.

The previous prime is 8191181. The next prime is 8191193. The reversal of 8191189 is 9811918.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4915089 + 3276100 = 2217^2 + 1810^2 .

It is a cyclic number.

It is not a de Polignac number, because 8191189 - 2³ = 8191181 is a prime.

It is a Chen prime.

8191189 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8191181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4095594 + 4095595.

It is an arithmetic number, because the mean of its divisors is an integer number (4095595).

Almost surely, 2^8191189 is an apocalyptic number.

It is an amenable number.

8191189 is a deficient number, since it is larger than the sum of its proper divisors (1).

8191189 is an equidigital number, since it uses as much as digits as its factorization.

8191189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 37.

The square root of 8191189 is about 2862.0253318236. The cubic root of 8191189 is about 201.5807154461.

The spelling of 8191189 in words is "eight million, one hundred ninety-one thousand, one hundred eighty-nine".