539804821 has 2 divisors, whose sum is σ = 539804822. Its totient is φ = 539804820.

The previous prime is 539804819. The next prime is 539804827. The reversal of 539804821 is 128408935.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 514654596 + 25150225 = 22686^2 + 5015^2 .

It is a cyclic number.

It is not a de Polignac number, because 539804821 - 2¹ = 539804819 is a prime.

Together with 539804819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (539804827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 269902410 + 269902411.

It is an arithmetic number, because the mean of its divisors is an integer number (269902411).

Almost surely, 2^539804821 is an apocalyptic number.

It is an amenable number.

539804821 is a deficient number, since it is larger than the sum of its proper divisors (1).

539804821 is an equidigital number, since it uses as much as digits as its factorization.

539804821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 539804821 is about 23233.7001142737. The cubic root of 539804821 is about 814.2271625416.

The spelling of 539804821 in words is "five hundred thirty-nine million, eight hundred four thousand, eight hundred twenty-one".