538306861 has 2 divisors, whose sum is σ = 538306862. Its totient is φ = 538306860.

The previous prime is 538306859. The next prime is 538306889. The reversal of 538306861 is 168603835.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 438106761 + 100200100 = 20931^2 + 10010^2 .

It is a cyclic number.

It is not a de Polignac number, because 538306861 - 2¹ = 538306859 is a prime.

Together with 538306859, 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 (538306831) 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, 269153430 + 269153431.

It is an arithmetic number, because the mean of its divisors is an integer number (269153431).

Almost surely, 2^538306861 is an apocalyptic number.

It is an amenable number.

538306861 is a deficient number, since it is larger than the sum of its proper divisors (1).

538306861 is an equidigital number, since it uses as much as digits as its factorization.

538306861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 538306861 is about 23201.4409250805. The cubic root of 538306861 is about 813.4733038502.

The spelling of 538306861 in words is "five hundred thirty-eight million, three hundred six thousand, eight hundred sixty-one".