501425387521 has 2 divisors, whose sum is σ = 501425387522. Its totient is φ = 501425387520.

The previous prime is 501425387513. The next prime is 501425387539. The reversal of 501425387521 is 125783524105.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 473221543921 + 28203843600 = 687911^2 + 167940^2 .

It is a cyclic number.

It is not a de Polignac number, because 501425387521 - 2³ = 501425387513 is a prime.

It is a super-3 number, since 3×501425387521³ (a number of 36 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (501425381521) 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, 250712693760 + 250712693761.

It is an arithmetic number, because the mean of its divisors is an integer number (250712693761).

Almost surely, 2^501425387521 is an apocalyptic number.

It is an amenable number.

501425387521 is a deficient number, since it is larger than the sum of its proper divisors (1).

501425387521 is an equidigital number, since it uses as much as digits as its factorization.

501425387521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336000, while the sum is 43.

The spelling of 501425387521 in words is "five hundred one billion, four hundred twenty-five million, three hundred eighty-seven thousand, five hundred twenty-one".