8191268639 has 8 divisors (see below), whose sum is σ = 8268123600. Its totient is φ = 8114490496.

The previous prime is 8191268623. The next prime is 8191268641. The reversal of 8191268639 is 9368621918.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8191268639 - 2⁴ = 8191268623 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 (8191268039) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207512 + ... + 243810.

It is an arithmetic number, because the mean of its divisors is an integer number (1033515450).

Almost surely, 2^8191268639 is an apocalyptic number.

8191268639 is a deficient number, since it is larger than the sum of its proper divisors (76854961).

8191268639 is a wasteful number, since it uses less digits than its factorization.

8191268639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38409.

The product of its digits is 1119744, while the sum is 53.

The square root of 8191268639 is about 90505.6276648033. The cubic root of 8191268639 is about 2015.8136873486.

The spelling of 8191268639 in words is "eight billion, one hundred ninety-one million, two hundred sixty-eight thousand, six hundred thirty-nine".