545256821 has 2 divisors, whose sum is σ = 545256822. Its totient is φ = 545256820.

The previous prime is 545256781. The next prime is 545256841. The reversal of 545256821 is 128652545.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 522351025 + 22905796 = 22855^2 + 4786^2 .

It is a cyclic number.

It is not a de Polignac number, because 545256821 - 2¹⁰ = 545255797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (545256841) 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, 272628410 + 272628411.

It is an arithmetic number, because the mean of its divisors is an integer number (272628411).

Almost surely, 2^545256821 is an apocalyptic number.

It is an amenable number.

545256821 is a deficient number, since it is larger than the sum of its proper divisors (1).

545256821 is an equidigital number, since it uses as much as digits as its factorization.

545256821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96000, while the sum is 38.

The square root of 545256821 is about 23350.7349134883. The cubic root of 545256821 is about 816.9592022842.

The spelling of 545256821 in words is "five hundred forty-five million, two hundred fifty-six thousand, eight hundred twenty-one".