521398563827 has 2 divisors, whose sum is σ = 521398563828. Its totient is φ = 521398563826.

The previous prime is 521398563799. The next prime is 521398563853. The reversal of 521398563827 is 728365893125.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 521398563827 - 2²⁸ = 521130128371 is a prime.

It is not a weakly prime, because it can be changed into another prime (521398563727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260699281913 + 260699281914.

It is an arithmetic number, because the mean of its divisors is an integer number (260699281914).

Almost surely, 2^521398563827 is an apocalyptic number.

521398563827 is a deficient number, since it is larger than the sum of its proper divisors (1).

521398563827 is an equidigital number, since it uses as much as digits as its factorization.

521398563827 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21772800, while the sum is 59.

The spelling of 521398563827 in words is "five hundred twenty-one billion, three hundred ninety-eight million, five hundred sixty-three thousand, eight hundred twenty-seven".