52140809 has 4 divisors (see below), whose sum is σ = 59589504. Its totient is φ = 44692116.

The previous prime is 52140757. The next prime is 52140821. The reversal of 52140809 is 90804125.

52140809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-52140809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (52140409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3724337 + ... + 3724350.

It is an arithmetic number, because the mean of its divisors is an integer number (14897376).

Almost surely, 2^52140809 is an apocalyptic number.

It is an amenable number.

52140809 is a deficient number, since it is larger than the sum of its proper divisors (7448695).

52140809 is an equidigital number, since it uses as much as digits as its factorization.

52140809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7448694.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 52140809 is about 7220.8592978952. The cubic root of 52140809 is about 373.5877166329.

The spelling of 52140809 in words is "fifty-two million, one hundred forty thousand, eight hundred nine".