521002481 has 2 divisors, whose sum is σ = 521002482. Its totient is φ = 521002480.

The previous prime is 521002421. The next prime is 521002483. The reversal of 521002481 is 184200125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 310288225 + 210714256 = 17615^2 + 14516^2 .

It is a cyclic number.

It is not a de Polignac number, because 521002481 - 2¹⁰ = 521001457 is a prime.

It is a super-2 number, since 2×521002481² = 542887170416310722, which contains 22 as substring.

Together with 521002483, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (521002483) 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, 260501240 + 260501241.

It is an arithmetic number, because the mean of its divisors is an integer number (260501241).

Almost surely, 2^521002481 is an apocalyptic number.

It is an amenable number.

521002481 is a deficient number, since it is larger than the sum of its proper divisors (1).

521002481 is an equidigital number, since it uses as much as digits as its factorization.

521002481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 521002481 is about 22825.4787682537. The cubic root of 521002481 is about 804.6615765584.

The spelling of 521002481 in words is "five hundred twenty-one million, two thousand, four hundred eighty-one".