53563865 has 4 divisors (see below), whose sum is σ = 64276644. Its totient is φ = 42851088.

The previous prime is 53563859. The next prime is 53563871. The reversal of 53563865 is 56836535.

53563865 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 is an interprime number because it is at equal distance from previous prime (53563859) and next prime (53563871).

It can be written as a sum of positive squares in 2 ways, for example, as 31058329 + 22505536 = 5573^2 + 4744^2 .

It is a cyclic number.

It is not a de Polignac number, because 53563865 - 2¹⁰ = 53562841 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

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, 5356382 + ... + 5356391.

It is an arithmetic number, because the mean of its divisors is an integer number (16069161).

Almost surely, 2^53563865 is an apocalyptic number.

It is an amenable number.

53563865 is a deficient number, since it is larger than the sum of its proper divisors (10712779).

53563865 is a wasteful number, since it uses less digits than its factorization.

53563865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10712778.

The product of its digits is 324000, while the sum is 41.

The square root of 53563865 is about 7318.7338385816. The cubic root of 53563865 is about 376.9559785086.

The spelling of 53563865 in words is "fifty-three million, five hundred sixty-three thousand, eight hundred sixty-five".