8252120909 has 4 divisors (see below), whose sum is σ = 8737539804. Its totient is φ = 7766702016.

The previous prime is 8252120893. The next prime is 8252120917. The reversal of 8252120909 is 9090212528.

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 4997076100 + 3255044809 = 70690^2 + 57053^2 .

It is a cyclic number.

It is not a de Polignac number, because 8252120909 - 2⁴ = 8252120893 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 (8252120939) 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, 242709422 + ... + 242709455.

It is an arithmetic number, because the mean of its divisors is an integer number (2184384951).

Almost surely, 2^8252120909 is an apocalyptic number.

It is an amenable number.

8252120909 is a deficient number, since it is larger than the sum of its proper divisors (485418895).

8252120909 is a wasteful number, since it uses less digits than its factorization.

8252120909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485418894.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 8252120909 is about 90841.1850924458. The cubic root of 8252120909 is about 2020.7931490576.

The spelling of 8252120909 in words is "eight billion, two hundred fifty-two million, one hundred twenty thousand, nine hundred nine".