53845821 has 6 divisors (see below), whose sum is σ = 77777310. Its totient is φ = 35897208.

The previous prime is 53845811. The next prime is 53845843. The reversal of 53845821 is 12854835.

It is a happy number.

53845821 is a `hidden beast` number, since 538 + 45 + 82 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 41100921 + 12744900 = 6411^2 + 3570^2 .

It is not a de Polignac number, because 53845821 - 2⁵ = 53845789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53845811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2991426 + ... + 2991443.

It is an arithmetic number, because the mean of its divisors is an integer number (12962885).

Almost surely, 2^53845821 is an apocalyptic number.

It is an amenable number.

53845821 is a deficient number, since it is larger than the sum of its proper divisors (23931489).

53845821 is a wasteful number, since it uses less digits than its factorization.

53845821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5982875 (or 5982872 counting only the distinct ones).

The product of its digits is 38400, while the sum is 36.

The square root of 53845821 is about 7337.9711773759. The cubic root of 53845821 is about 377.6162436044.

The spelling of 53845821 in words is "fifty-three million, eight hundred forty-five thousand, eight hundred twenty-one".