53857129 has 4 divisors (see below), whose sum is σ = 53934660. Its totient is φ = 53779600.

The previous prime is 53857127. The next prime is 53857151. The reversal of 53857129 is 92175835.

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 51151104 + 2706025 = 7152^2 + 1645^2 .

It is a cyclic number.

It is not a de Polignac number, because 53857129 - 2¹ = 53857127 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 53857091 and 53857100.

It is not an unprimeable number, because it can be changed into a prime (53857127) 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, 37714 + ... + 39115.

It is an arithmetic number, because the mean of its divisors is an integer number (13483665).

Almost surely, 2^53857129 is an apocalyptic number.

It is an amenable number.

53857129 is a deficient number, since it is larger than the sum of its proper divisors (77531).

53857129 is an equidigital number, since it uses as much as digits as its factorization.

53857129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77530.

The product of its digits is 75600, while the sum is 40.

The square root of 53857129 is about 7338.7416496290. The cubic root of 53857129 is about 377.6426757739.

The spelling of 53857129 in words is "fifty-three million, eight hundred fifty-seven thousand, one hundred twenty-nine".