53503921 has 4 divisors (see below), whose sum is σ = 53542692. Its totient is φ = 53465152.

The previous prime is 53503889. The next prime is 53503969. The reversal of 53503921 is 12930535.

53503921 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 40144896 + 13359025 = 6336^2 + 3655^2 .

It is a cyclic number.

It is not a de Polignac number, because 53503921 - 2⁵ = 53503889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 53503921.

It is not an unprimeable number, because it can be changed into a prime (53503991) 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, 17236 + ... + 20101.

It is an arithmetic number, because the mean of its divisors is an integer number (13385673).

Almost surely, 2^53503921 is an apocalyptic number.

It is an amenable number.

53503921 is a deficient number, since it is larger than the sum of its proper divisors (38771).

53503921 is a wasteful number, since it uses less digits than its factorization.

53503921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38770.

The product of its (nonzero) digits is 4050, while the sum is 28.

The square root of 53503921 is about 7314.6374482950. The cubic root of 53503921 is about 376.8153072826.

The spelling of 53503921 in words is "fifty-three million, five hundred three thousand, nine hundred twenty-one".