545107721 has 2 divisors, whose sum is σ = 545107722. Its totient is φ = 545107720.

The previous prime is 545107711. The next prime is 545107747. The reversal of 545107721 is 127701545.

545107721 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., 368217721 + 176890000 = 19189^2 + 13300^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-545107721 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (545107711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272553860 + 272553861.

It is an arithmetic number, because the mean of its divisors is an integer number (272553861).

Almost surely, 2^545107721 is an apocalyptic number.

It is an amenable number.

545107721 is a deficient number, since it is larger than the sum of its proper divisors (1).

545107721 is an equidigital number, since it uses as much as digits as its factorization.

545107721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9800, while the sum is 32.

The square root of 545107721 is about 23347.5420762015. The cubic root of 545107721 is about 816.8847299030.

The spelling of 545107721 in words is "five hundred forty-five million, one hundred seven thousand, seven hundred twenty-one".