521031481 has 2 divisors, whose sum is σ = 521031482. Its totient is φ = 521031480.

The previous prime is 521031479. The next prime is 521031503. The reversal of 521031481 is 184130125.

521031481 = 16140² + 16141².

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 260531881 + 260499600 = 16141^2 + 16140^2 .

It is a cyclic number.

It is not a de Polignac number, because 521031481 - 2¹ = 521031479 is a prime.

It is a super-2 number, since 2×521031481² = 542947608386106722, which contains 22 as substring.

Together with 521031479, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (521035481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260515740 + 260515741.

It is an arithmetic number, because the mean of its divisors is an integer number (260515741).

Almost surely, 2^521031481 is an apocalyptic number.

521031481 is the 16141-st centered square number.

It is an amenable number.

521031481 is a deficient number, since it is larger than the sum of its proper divisors (1).

521031481 is an equidigital number, since it uses as much as digits as its factorization.

521031481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 521031481 is about 22826.1140144353. The cubic root of 521031481 is about 804.6765059517.

The spelling of 521031481 in words is "five hundred twenty-one million, thirty-one thousand, four hundred eighty-one".