54563820921 has 9 divisors (see below), whose sum is σ = 78815420229. Its totient is φ = 36375413436.

The previous prime is 54563820919. The next prime is 54563820947. The reversal of 54563820921 is 12902836545.

The square root of 54563820921 is 233589.

It is a perfect power (a square), and thus also a powerful number.

54563820921 is a `hidden beast` number, since 5 + 4 + 5 + 638 + 2 + 0 + 9 + 2 + 1 = 666.

54563820921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 54563820921 - 2¹ = 54563820919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (54563820901) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 661836 + ... + 739698.

Almost surely, 2^54563820921 is an apocalyptic number.

54563820921 is the 233589-th square number.

54563820921 is the 116795-th centered octagonal number.

It is an amenable number.

54563820921 is a deficient number, since it is larger than the sum of its proper divisors (24251599308).

54563820921 is an frugal number, since it uses more digits than its factorization.

54563820921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155732 (or 77866 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The spelling of 54563820921 in words is "fifty-four billion, five hundred sixty-three million, eight hundred twenty thousand, nine hundred twenty-one".