52512209 has 4 divisors (see below), whose sum is σ = 52580916. Its totient is φ = 52443504.

The previous prime is 52512179. The next prime is 52512217. The reversal of 52512209 is 90221525.

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 25472209 + 27040000 = 5047^2 + 5200^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-52512209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (52512809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33194 + ... + 34739.

It is an arithmetic number, because the mean of its divisors is an integer number (13145229).

Almost surely, 2^52512209 is an apocalyptic number.

It is an amenable number.

52512209 is a deficient number, since it is larger than the sum of its proper divisors (68707).

52512209 is an equidigital number, since it uses as much as digits as its factorization.

52512209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68706.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 52512209 is about 7246.5308251604. The cubic root of 52512209 is about 374.4726430296.

The spelling of 52512209 in words is "fifty-two million, five hundred twelve thousand, two hundred nine".