521520163 has 2 divisors, whose sum is σ = 521520164. Its totient is φ = 521520162.

The previous prime is 521520127. The next prime is 521520191. The reversal of 521520163 is 361025125.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 521520163 - 2¹⁷ = 521389091 is a prime.

It is equal to p_27428200 and since 521520163 and 27428200 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (521520463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260760081 + 260760082.

It is an arithmetic number, because the mean of its divisors is an integer number (260760082).

Almost surely, 2^521520163 is an apocalyptic number.

521520163 is a deficient number, since it is larger than the sum of its proper divisors (1).

521520163 is an equidigital number, since it uses as much as digits as its factorization.

521520163 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 521520163 is about 22836.8159558201. The cubic root of 521520163 is about 804.9279994243.

Adding to 521520163 its reverse (361025125), we get a palindrome (882545288).

The spelling of 521520163 in words is "five hundred twenty-one million, five hundred twenty thousand, one hundred sixty-three".