54345721 has 2 divisors, whose sum is σ = 54345722. Its totient is φ = 54345720.

The previous prime is 54345703. The next prime is 54345761. The reversal of 54345721 is 12754345.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39438400 + 14907321 = 6280^2 + 3861^2 .

It is a cyclic number.

It is not a de Polignac number, because 54345721 - 2⁵ = 54345689 is a prime.

It is not a weakly prime, because it can be changed into another prime (54345761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27172860 + 27172861.

It is an arithmetic number, because the mean of its divisors is an integer number (27172861).

Almost surely, 2^54345721 is an apocalyptic number.

It is an amenable number.

54345721 is a deficient number, since it is larger than the sum of its proper divisors (1).

54345721 is an equidigital number, since it uses as much as digits as its factorization.

54345721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16800, while the sum is 31.

The square root of 54345721 is about 7371.9550324185. The cubic root of 54345721 is about 378.7812314358.

It can be divided in two parts, 543 and 45721, that added together give a palindrome (46264).

The spelling of 54345721 in words is "fifty-four million, three hundred forty-five thousand, seven hundred twenty-one".