8218152191 has 2 divisors, whose sum is σ = 8218152192. Its totient is φ = 8218152190.

The previous prime is 8218152179. The next prime is 8218152209. The reversal of 8218152191 is 1912518128.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8218152191 - 2⁶ = 8218152127 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8218152391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4109076095 + 4109076096.

It is an arithmetic number, because the mean of its divisors is an integer number (4109076096).

Almost surely, 2^8218152191 is an apocalyptic number.

8218152191 is a deficient number, since it is larger than the sum of its proper divisors (1).

8218152191 is an equidigital number, since it uses as much as digits as its factorization.

8218152191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 38.

The square root of 8218152191 is about 90654.0246817537. The cubic root of 8218152191 is about 2018.0165636247.

The spelling of 8218152191 in words is "eight billion, two hundred eighteen million, one hundred fifty-two thousand, one hundred ninety-one".