8538702521 has 2 divisors, whose sum is σ = 8538702522. Its totient is φ = 8538702520.

The previous prime is 8538702479. The next prime is 8538702533. The reversal of 8538702521 is 1252078358.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8538684025 + 18496 = 92405^2 + 136^2 .

It is a cyclic number.

It is not a de Polignac number, because 8538702521 - 2⁶ = 8538702457 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (8534702521) 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, 4269351260 + 4269351261.

It is an arithmetic number, because the mean of its divisors is an integer number (4269351261).

Almost surely, 2^8538702521 is an apocalyptic number.

It is an amenable number.

8538702521 is a deficient number, since it is larger than the sum of its proper divisors (1).

8538702521 is an equidigital number, since it uses as much as digits as its factorization.

8538702521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 134400, while the sum is 41.

The square root of 8538702521 is about 92405.1000811102. The cubic root of 8538702521 is about 2043.9203193529.

The spelling of 8538702521 in words is "eight billion, five hundred thirty-eight million, seven hundred two thousand, five hundred twenty-one".