53621729 has 6 divisors (see below), whose sum is σ = 62376354. Its totient is φ = 45961440.

The previous prime is 53621719. The next prime is 53621741. The reversal of 53621729 is 92712635.

53621729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 52591504 + 1030225 = 7252^2 + 1015^2 .

It is not a de Polignac number, because 53621729 - 2²⁰ = 52573153 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (53621719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 547112 + ... + 547209.

It is an arithmetic number, because the mean of its divisors is an integer number (10396059).

Almost surely, 2^53621729 is an apocalyptic number.

It is an amenable number.

53621729 is a deficient number, since it is larger than the sum of its proper divisors (8754625).

53621729 is a wasteful number, since it uses less digits than its factorization.

53621729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1094335 (or 1094328 counting only the distinct ones).

The product of its digits is 22680, while the sum is 35.

The square root of 53621729 is about 7322.6859143350. The cubic root of 53621729 is about 377.0916690593.

The spelling of 53621729 in words is "fifty-three million, six hundred twenty-one thousand, seven hundred twenty-nine".