54235721 has 2 divisors, whose sum is σ = 54235722. Its totient is φ = 54235720.

The previous prime is 54235681. The next prime is 54235723. The reversal of 54235721 is 12753245.

It is a happy number.

54235721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54228496 + 7225 = 7364^2 + 85^2 .

It is a cyclic number.

It is not a de Polignac number, because 54235721 - 2¹⁴ = 54219337 is a prime.

It is a super-3 number, since 3×54235721³ (a number of 24 digits) contains 333 as substring.

Together with 54235723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (54235723) 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, 27117860 + 27117861.

It is an arithmetic number, because the mean of its divisors is an integer number (27117861).

Almost surely, 2^54235721 is an apocalyptic number.

It is an amenable number.

54235721 is a deficient number, since it is larger than the sum of its proper divisors (1).

54235721 is an equidigital number, since it uses as much as digits as its factorization.

54235721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8400, while the sum is 29.

The square root of 54235721 is about 7364.4905458558. The cubic root of 54235721 is about 378.5254978469.

Adding to 54235721 its reverse (12753245), we get a palindrome (66988966).

It can be divided in two parts, 542 and 35721, that added together give a palindrome (36263).

The spelling of 54235721 in words is "fifty-four million, two hundred thirty-five thousand, seven hundred twenty-one".