8205730129 has 4 divisors (see below), whose sum is σ = 8257996084. Its totient is φ = 8153464176.

The previous prime is 8205730111. The next prime is 8205730147. The reversal of 8205730129 is 9210375028.

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

It is an interprime number because it is at equal distance from previous prime (8205730111) and next prime (8205730147).

It can be written as a sum of positive squares in 2 ways, for example, as 1967099904 + 6238630225 = 44352^2 + 78985^2 .

It is a cyclic number.

It is not a de Polignac number, because 8205730129 - 2¹⁵ = 8205697361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8205730109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26132742 + ... + 26133055.

It is an arithmetic number, because the mean of its divisors is an integer number (2064499021).

Almost surely, 2^8205730129 is an apocalyptic number.

It is an amenable number.

8205730129 is a deficient number, since it is larger than the sum of its proper divisors (52265955).

8205730129 is a wasteful number, since it uses less digits than its factorization.

8205730129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52265954.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 8205730129 is about 90585.4852004448. The cubic root of 8205730129 is about 2016.9992802869. Note that the first 3 decimals are identical.

The spelling of 8205730129 in words is "eight billion, two hundred five million, seven hundred thirty thousand, one hundred twenty-nine".