538518521 has 2 divisors, whose sum is σ = 538518522. Its totient is φ = 538518520.

The previous prime is 538518499. The next prime is 538518529. The reversal of 538518521 is 125815835.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 472584121 + 65934400 = 21739^2 + 8120^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-538518521 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (538518529) 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, 269259260 + 269259261.

It is an arithmetic number, because the mean of its divisors is an integer number (269259261).

Almost surely, 2^538518521 is an apocalyptic number.

It is an amenable number.

538518521 is a deficient number, since it is larger than the sum of its proper divisors (1).

538518521 is an equidigital number, since it uses as much as digits as its factorization.

538518521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48000, while the sum is 38.

The square root of 538518521 is about 23206.0018314228. The cubic root of 538518521 is about 813.5799079764.

The spelling of 538518521 in words is "five hundred thirty-eight million, five hundred eighteen thousand, five hundred twenty-one".