53509139 has 4 divisors (see below), whose sum is σ = 54386400. Its totient is φ = 52631880.

The previous prime is 53509133. The next prime is 53509153. The reversal of 53509139 is 93190535.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 53509139 - 2⁴ = 53509123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 53509099 and 53509108.

It is not an unprimeable number, because it can be changed into a prime (53509133) 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, 438539 + ... + 438660.

It is an arithmetic number, because the mean of its divisors is an integer number (13596600).

Almost surely, 2^53509139 is an apocalyptic number.

53509139 is a deficient number, since it is larger than the sum of its proper divisors (877261).

53509139 is an equidigital number, since it uses as much as digits as its factorization.

53509139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 877260.

The product of its (nonzero) digits is 18225, while the sum is 35.

The square root of 53509139 is about 7314.9941216654. The cubic root of 53509139 is about 376.8275565927.

The spelling of 53509139 in words is "fifty-three million, five hundred nine thousand, one hundred thirty-nine".