53318821 has 4 divisors (see below), whose sum is σ = 54453312. Its totient is φ = 52184332.

The previous prime is 53318789. The next prime is 53318827. The reversal of 53318821 is 12881335.

53318821 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 53318821 - 2⁵ = 53318789 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53318827) 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, 567175 + ... + 567268.

It is an arithmetic number, because the mean of its divisors is an integer number (13613328).

Almost surely, 2^53318821 is an apocalyptic number.

It is an amenable number.

53318821 is a deficient number, since it is larger than the sum of its proper divisors (1134491).

53318821 is a wasteful number, since it uses less digits than its factorization.

53318821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1134490.

The product of its digits is 5760, while the sum is 31.

The square root of 53318821 is about 7301.9737742613. The cubic root of 53318821 is about 376.3802668839.

The spelling of 53318821 in words is "fifty-three million, three hundred eighteen thousand, eight hundred twenty-one".