8501428109 has 4 divisors (see below), whose sum is σ = 8530443516. Its totient is φ = 8472412704.

The previous prime is 8501428081. The next prime is 8501428121. The reversal of 8501428109 is 9018241058.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3819858025 + 4681570084 = 61805^2 + 68422^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8501428109 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8501428139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14507264 + ... + 14507849.

It is an arithmetic number, because the mean of its divisors is an integer number (2132610879).

Almost surely, 2^8501428109 is an apocalyptic number.

It is an amenable number.

8501428109 is a deficient number, since it is larger than the sum of its proper divisors (29015407).

8501428109 is a wasteful number, since it uses less digits than its factorization.

8501428109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29015406.

The product of its (nonzero) digits is 23040, while the sum is 38.

The square root of 8501428109 is about 92203.1892561206. The cubic root of 8501428109 is about 2040.9418396247.

The spelling of 8501428109 in words is "eight billion, five hundred one million, four hundred twenty-eight thousand, one hundred nine".