54055621 has 2 divisors, whose sum is σ = 54055622. Its totient is φ = 54055620.

The previous prime is 54055619. The next prime is 54055643. The reversal of 54055621 is 12655045.

54055621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52056225 + 1999396 = 7215^2 + 1414^2 .

It is a cyclic number.

It is not a de Polignac number, because 54055621 - 2¹ = 54055619 is a prime.

Together with 54055619, it forms a pair of twin primes.

It is equal to p_3229309 and since 54055621 and 3229309 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 54055621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54055691) 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 as a sum of consecutive naturals, namely, 27027810 + 27027811.

It is an arithmetic number, because the mean of its divisors is an integer number (27027811).

Almost surely, 2^54055621 is an apocalyptic number.

It is an amenable number.

54055621 is a deficient number, since it is larger than the sum of its proper divisors (1).

54055621 is an equidigital number, since it uses as much as digits as its factorization.

54055621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 54055621 is about 7352.2527840112. The cubic root of 54055621 is about 378.1060446387.

It can be divided in two parts, 5405 and 5621, that added together give a triangular number (11026 = T₁₄₈).

The spelling of 54055621 in words is "fifty-four million, fifty-five thousand, six hundred twenty-one".