8129705187 has 8 divisors (see below), whose sum is σ = 10874239504. Its totient is φ = 5402487168.

The previous prime is 8129705153. The next prime is 8129705191. The reversal of 8129705187 is 7815079218.

It is a happy number.

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

It is not a de Polignac number, because 8129705187 - 2¹² = 8129701091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8129705107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4327978 + ... + 4329855.

It is an arithmetic number, because the mean of its divisors is an integer number (1359279938).

Almost surely, 2^8129705187 is an apocalyptic number.

8129705187 is a deficient number, since it is larger than the sum of its proper divisors (2744534317).

8129705187 is a wasteful number, since it uses less digits than its factorization.

8129705187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8658149.

The product of its (nonzero) digits is 282240, while the sum is 48.

The square root of 8129705187 is about 90164.8777906342. The cubic root of 8129705187 is about 2010.7508714153.

The spelling of 8129705187 in words is "eight billion, one hundred twenty-nine million, seven hundred five thousand, one hundred eighty-seven".