8509705901 has 4 divisors (see below), whose sum is σ = 8511531612. Its totient is φ = 8507880192.

The previous prime is 8509705889. The next prime is 8509705909. The reversal of 8509705901 is 1095079058.

It is a happy number.

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 6646488676 + 1863217225 = 81526^2 + 43165^2 .

It is a cyclic number.

It is not a de Polignac number, because 8509705901 - 2¹⁸ = 8509443757 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 (8509705909) 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, 905846 + ... + 915191.

It is an arithmetic number, because the mean of its divisors is an integer number (2127882903).

Almost surely, 2^8509705901 is an apocalyptic number.

It is an amenable number.

8509705901 is a deficient number, since it is larger than the sum of its proper divisors (1825711).

8509705901 is a wasteful number, since it uses less digits than its factorization.

8509705901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1825710.

The product of its (nonzero) digits is 113400, while the sum is 44.

The square root of 8509705901 is about 92248.0671938442. The cubic root of 8509705901 is about 2041.6040425480.

The spelling of 8509705901 in words is "eight billion, five hundred nine million, seven hundred five thousand, nine hundred one".