517405437481 has 9 divisors (see below), whose sum is σ = 518707053669. Its totient is φ = 516107084736.

The previous prime is 517405437469. The next prime is 517405437583. The reversal of 517405437481 is 184734504715.

The square root of 517405437481 is 719309.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 104496381081 + 412909056400 = 323259^2 + 642580^2 .

It is not a de Polignac number, because 517405437481 - 2¹⁷ = 517405306409 is a prime.

It is a super-2 number, since 2×517405437481² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (517405137481) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 426549631 + ... + 426550843.

Almost surely, 2^517405437481 is an apocalyptic number.

517405437481 is the 719309-th square number.

517405437481 is the 359655-th centered octagonal number.

It is an amenable number.

517405437481 is a deficient number, since it is larger than the sum of its proper divisors (1301616188).

517405437481 is an frugal number, since it uses more digits than its factorization.

517405437481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3612 (or 1806 counting only the distinct ones).

The product of its (nonzero) digits is 1881600, while the sum is 49.

Multiplying 517405437481 by its sum of digits (49), we get a square (25352866436569 = 5035163²).

The spelling of 517405437481 in words is "five hundred seventeen billion, four hundred five million, four hundred thirty-seven thousand, four hundred eighty-one".