53595721 has 4 divisors (see below), whose sum is σ = 55044292. Its totient is φ = 52147152.

The previous prime is 53595719. The next prime is 53595739. The reversal of 53595721 is 12759535.

It is a happy number.

53595721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 38688400 + 14907321 = 6220^2 + 3861^2 .

It is a cyclic number.

It is not a de Polignac number, because 53595721 - 2¹ = 53595719 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 1448533 = 53595721 / (5 + 3 + 5 + 9 + 5 + 7 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53595761) 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 3 ways as a sum of consecutive naturals, for example, 724230 + ... + 724303.

It is an arithmetic number, because the mean of its divisors is an integer number (13761073).

Almost surely, 2^53595721 is an apocalyptic number.

It is an amenable number.

53595721 is a deficient number, since it is larger than the sum of its proper divisors (1448571).

53595721 is a wasteful number, since it uses less digits than its factorization.

53595721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1448570.

The product of its digits is 47250, while the sum is 37.

The square root of 53595721 is about 7320.9098478263. The cubic root of 53595721 is about 377.0306926209.

The spelling of 53595721 in words is "fifty-three million, five hundred ninety-five thousand, seven hundred twenty-one".