8191796213 has 2 divisors, whose sum is σ = 8191796214. Its totient is φ = 8191796212.

The previous prime is 8191796191. The next prime is 8191796237. The reversal of 8191796213 is 3126971918.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6162564004 + 2029232209 = 78502^2 + 45047^2 .

It is a cyclic number.

It is not a de Polignac number, because 8191796213 - 2⁶ = 8191796149 is a prime.

It is a super-2 number, since 2×8191796213² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8191796293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4095898106 + 4095898107.

It is an arithmetic number, because the mean of its divisors is an integer number (4095898107).

Almost surely, 2^8191796213 is an apocalyptic number.

It is an amenable number.

8191796213 is a deficient number, since it is larger than the sum of its proper divisors (1).

8191796213 is an equidigital number, since it uses as much as digits as its factorization.

8191796213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 47.

The square root of 8191796213 is about 90508.5422101141. The cubic root of 8191796213 is about 2015.8569638383.

The spelling of 8191796213 in words is "eight billion, one hundred ninety-one million, seven hundred ninety-six thousand, two hundred thirteen".