53375621 has 4 divisors (see below), whose sum is σ = 57481452. Its totient is φ = 49269792.

The previous prime is 53375593. The next prime is 53375627. The reversal of 53375621 is 12657335.

53375621 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 27984100 + 25391521 = 5290^2 + 5039^2 .

It is a de Polignac number, because none of the positive numbers 2^k-53375621 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 (53375627) 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, 2052896 + ... + 2052921.

It is an arithmetic number, because the mean of its divisors is an integer number (14370363).

Almost surely, 2^53375621 is an apocalyptic number.

It is an amenable number.

53375621 is a deficient number, since it is larger than the sum of its proper divisors (4105831).

53375621 is a wasteful number, since it uses less digits than its factorization.

53375621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4105830.

The product of its digits is 18900, while the sum is 32.

The square root of 53375621 is about 7305.8620983427. The cubic root of 53375621 is about 376.5138708149.

The spelling of 53375621 in words is "fifty-three million, three hundred seventy-five thousand, six hundred twenty-one".