54721 has 2 divisors, whose sum is σ = 54722. Its totient is φ = 54720.

The previous prime is 54713. The next prime is 54727. The reversal of 54721 is 12745.

54721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is the 96-th star number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50625 + 4096 = 225^2 + 64^2 .

It is a cyclic number.

It is not a de Polignac number, because 54721 - 2³ = 54713 is a prime.

It is an alternating number because its digits alternate between odd and even.

54721 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27360 + 27361.

It is an arithmetic number, because the mean of its divisors is an integer number (27361).

2⁵⁴⁷²¹ is an apocalyptic number.

It is an amenable number.

54721 is a deficient number, since it is larger than the sum of its proper divisors (1).

54721 is an equidigital number, since it uses as much as digits as its factorization.

54721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 280, while the sum is 19.

The square root of 54721 is about 233.9252017205. The cubic root of 54721 is about 37.9651110983.

The spelling of 54721 in words is "fifty-four thousand, seven hundred twenty-one".