54821815 has 4 divisors (see below), whose sum is σ = 65786184. Its totient is φ = 43857448.

The previous prime is 54821807. The next prime is 54821831. The reversal of 54821815 is 51812845.

54821815 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 a cyclic number.

It is not a de Polignac number, because 54821815 - 2³ = 54821807 is a prime.

It is a Duffinian number.

It is a congruent 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, 5482177 + ... + 5482186.

It is an arithmetic number, because the mean of its divisors is an integer number (16446546).

Almost surely, 2^54821815 is an apocalyptic number.

54821815 is a deficient number, since it is larger than the sum of its proper divisors (10964369).

54821815 is a wasteful number, since it uses less digits than its factorization.

54821815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10964368.

The product of its digits is 12800, while the sum is 34.

The square root of 54821815 is about 7404.1755111559. The cubic root of 54821815 is about 379.8841174810.

The spelling of 54821815 in words is "fifty-four million, eight hundred twenty-one thousand, eight hundred fifteen".