53545721 has 2 divisors, whose sum is σ = 53545722. Its totient is φ = 53545720.

The previous prime is 53545717. The next prime is 53545747. The reversal of 53545721 is 12754535.

53545721 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., 36735721 + 16810000 = 6061^2 + 4100^2 .

It is a cyclic number.

It is not a de Polignac number, because 53545721 - 2² = 53545717 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (53542721) 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, 26772860 + 26772861.

It is an arithmetic number, because the mean of its divisors is an integer number (26772861).

Almost surely, 2^53545721 is an apocalyptic number.

It is an amenable number.

53545721 is a deficient number, since it is larger than the sum of its proper divisors (1).

53545721 is an equidigital number, since it uses as much as digits as its factorization.

53545721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21000, while the sum is 32.

The square root of 53545721 is about 7317.4941749208. The cubic root of 53545721 is about 376.9134108704.

The spelling of 53545721 in words is "fifty-three million, five hundred forty-five thousand, seven hundred twenty-one".