520543491169 has 81 divisors (see below), whose sum is σ = 626818206483. Its totient is φ = 431991784224.

The previous prime is 520543491161. The next prime is 520543491227. The reversal of 520543491169 is 961194345025.

The square root of 520543491169 is 721487.

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

It can be written as a sum of positive squares in only one way, i.e., 77003475025 + 443540016144 = 277495^2 + 665988^2 .

It is not a de Polignac number, because 520543491169 - 2³ = 520543491161 is a prime.

It is a super-2 number, since 2×520543491169² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (520543491161) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 4098767584 + ... + 4098767710.

Almost surely, 2^520543491169 is an apocalyptic number.

520543491169 is the 721487-th square number.

520543491169 is the 360744-th centered octagonal number.

It is an amenable number.

520543491169 is a deficient number, since it is larger than the sum of its proper divisors (106274715314).

520543491169 is a wasteful number, since it uses less digits than its factorization.

520543491169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364 (or 182 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 49.

Multiplying 520543491169 by its sum of digits (49), we get a square (25506631067281 = 5050409²).

The spelling of 520543491169 in words is "five hundred twenty billion, five hundred forty-three million, four hundred ninety-one thousand, one hundred sixty-nine".