8138320191 has 6 divisors (see below), whose sum is σ = 11755351400. Its totient is φ = 5425546788.

The previous prime is 8138320171. The next prime is 8138320213. The reversal of 8138320191 is 1910238318.

It is not a de Polignac number, because 8138320191 - 2¹³ = 8138311999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8138320171) 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 5 ways as a sum of consecutive naturals, for example, 452128891 + ... + 452128908.

Almost surely, 2^8138320191 is an apocalyptic number.

8138320191 is a deficient number, since it is larger than the sum of its proper divisors (3617031209).

8138320191 is a wasteful number, since it uses less digits than its factorization.

8138320191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 904257805 (or 904257802 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 8138320191 is about 90212.6387542233. The cubic root of 8138320191 is about 2011.4608812334.

It can be divided in two parts, 8138 and 320191, that added together give a square (328329 = 573²).

The spelling of 8138320191 in words is "eight billion, one hundred thirty-eight million, three hundred twenty thousand, one hundred ninety-one".