521812481 has 2 divisors, whose sum is σ = 521812482. Its totient is φ = 521812480.

The previous prime is 521812469. The next prime is 521812531. The reversal of 521812481 is 184218125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 517335025 + 4477456 = 22745^2 + 2116^2 .

It is a cyclic number.

It is not a de Polignac number, because 521812481 - 2¹⁰ = 521811457 is a prime.

It is a super-2 number, since 2×521812481² = 544576530654750722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (521812411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260906240 + 260906241.

It is an arithmetic number, because the mean of its divisors is an integer number (260906241).

Almost surely, 2^521812481 is an apocalyptic number.

It is an amenable number.

521812481 is a deficient number, since it is larger than the sum of its proper divisors (1).

521812481 is an equidigital number, since it uses as much as digits as its factorization.

521812481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5120, while the sum is 32.

The square root of 521812481 is about 22843.2152071463. The cubic root of 521812481 is about 805.0783617762.

The spelling of 521812481 in words is "five hundred twenty-one million, eight hundred twelve thousand, four hundred eighty-one".