8219344391 has 4 divisors (see below), whose sum is σ = 8441488872. Its totient is φ = 7997199912.

The previous prime is 8219344381. The next prime is 8219344417. The reversal of 8219344391 is 1934439128.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 8219344391 - 2¹⁸ = 8219082247 is a prime.

It is a super-3 number, since 3×8219344391³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8219344351) 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 3 ways as a sum of consecutive naturals, for example, 111072185 + ... + 111072258.

It is an arithmetic number, because the mean of its divisors is an integer number (2110372218).

Almost surely, 2^8219344391 is an apocalyptic number.

8219344391 is a deficient number, since it is larger than the sum of its proper divisors (222144481).

8219344391 is a wasteful number, since it uses less digits than its factorization.

8219344391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222144480.

The product of its digits is 186624, while the sum is 44.

The square root of 8219344391 is about 90660.5999924995. The cubic root of 8219344391 is about 2018.1141428599.

The spelling of 8219344391 in words is "eight billion, two hundred nineteen million, three hundred forty-four thousand, three hundred ninety-one".