814538521 has 2 divisors, whose sum is σ = 814538522. Its totient is φ = 814538520.

The previous prime is 814538519. The next prime is 814538539. The reversal of 814538521 is 125835418.

814538521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 814303296 + 235225 = 28536^2 + 485^2 .

It is a cyclic number.

It is not a de Polignac number, because 814538521 - 2¹ = 814538519 is a prime.

Together with 814538519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (814538581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407269260 + 407269261.

It is an arithmetic number, because the mean of its divisors is an integer number (407269261).

Almost surely, 2^814538521 is an apocalyptic number.

It is an amenable number.

814538521 is a deficient number, since it is larger than the sum of its proper divisors (1).

814538521 is an equidigital number, since it uses as much as digits as its factorization.

814538521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38400, while the sum is 37.

The square root of 814538521 is about 28540.1212506184. The cubic root of 814538521 is about 933.9075274469.

The spelling of 814538521 in words is "eight hundred fourteen million, five hundred thirty-eight thousand, five hundred twenty-one".