53117209 has 4 divisors (see below), whose sum is σ = 53844916. Its totient is φ = 52389504.

The previous prime is 53117201. The next prime is 53117219. The reversal of 53117209 is 90271135.

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 26625600 + 26491609 = 5160^2 + 5147^2 .

It is a cyclic number.

It is not a de Polignac number, because 53117209 - 2³ = 53117201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53117201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 363744 + ... + 363889.

It is an arithmetic number, because the mean of its divisors is an integer number (13461229).

Almost surely, 2^53117209 is an apocalyptic number.

It is an amenable number.

53117209 is a deficient number, since it is larger than the sum of its proper divisors (727707).

53117209 is an equidigital number, since it uses as much as digits as its factorization.

53117209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 727706.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 53117209 is about 7288.1553907693. The cubic root of 53117209 is about 375.9052712358.

The spelling of 53117209 in words is "fifty-three million, one hundred seventeen thousand, two hundred nine".