53209009 has 4 divisors (see below), whose sum is σ = 60810304. Its totient is φ = 45607716.

The previous prime is 53208983. The next prime is 53209111. The reversal of 53209009 is 90090235.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90090235 = 5 ⋅18018047.

It is not a de Polignac number, because 53209009 - 2²¹ = 51111857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53209309) 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, 3800637 + ... + 3800650.

It is an arithmetic number, because the mean of its divisors is an integer number (15202576).

Almost surely, 2^53209009 is an apocalyptic number.

It is an amenable number.

53209009 is a deficient number, since it is larger than the sum of its proper divisors (7601295).

53209009 is an equidigital number, since it uses as much as digits as its factorization.

53209009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7601294.

The product of its (nonzero) digits is 2430, while the sum is 28.

The square root of 53209009 is about 7294.4505618998. The cubic root of 53209009 is about 376.1216997972.

The spelling of 53209009 in words is "fifty-three million, two hundred nine thousand, nine".