539150021 has 2 divisors, whose sum is σ = 539150022. Its totient is φ = 539150020.

The previous prime is 539150011. The next prime is 539150071. The reversal of 539150021 is 120051935.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 402002500 + 137147521 = 20050^2 + 11711^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-539150021 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (539150011) 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, 269575010 + 269575011.

It is an arithmetic number, because the mean of its divisors is an integer number (269575011).

Almost surely, 2^539150021 is an apocalyptic number.

It is an amenable number.

539150021 is a deficient number, since it is larger than the sum of its proper divisors (1).

539150021 is an equidigital number, since it uses as much as digits as its factorization.

539150021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1350, while the sum is 26.

The square root of 539150021 is about 23219.6042386601. The cubic root of 539150021 is about 813.8978017251.

The spelling of 539150021 in words is "five hundred thirty-nine million, one hundred fifty thousand, twenty-one".