53124509 has 4 divisors (see below), whose sum is σ = 53852316. Its totient is φ = 52396704.

The previous prime is 53124499. The next prime is 53124517. The reversal of 53124509 is 90542135.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90542135 = 5 ⋅18108427.

It can be written as a sum of positive squares in 2 ways, for example, as 40005625 + 13118884 = 6325^2 + 3622^2 .

It is a cyclic number.

It is not a de Polignac number, because 53124509 - 2²⁴ = 36347293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53124569) 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, 363794 + ... + 363939.

It is an arithmetic number, because the mean of its divisors is an integer number (13463079).

Almost surely, 2^53124509 is an apocalyptic number.

It is an amenable number.

53124509 is a deficient number, since it is larger than the sum of its proper divisors (727807).

53124509 is an equidigital number, since it uses as much as digits as its factorization.

53124509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 727806.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 53124509 is about 7288.6561861567. The cubic root of 53124509 is about 375.9224909080.

The spelling of 53124509 in words is "fifty-three million, one hundred twenty-four thousand, five hundred nine".