506535394369 has 3 divisors (see below), whose sum is σ = 506536106083. Its totient is φ = 506534682656.

The previous prime is 506535394367. The next prime is 506535394403. The reversal of 506535394369 is 963493535605.

The square root of 506535394369 is 711713.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 119263169025 + 387272225344 = 345345^2 + 622312^2 .

It is not a de Polignac number, because 506535394369 - 2¹ = 506535394367 is a prime.

It is a super-2 number, since 2×506535394369² (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 (506535394363) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 355857 + ... + 1067569.

Almost surely, 2^506535394369 is an apocalyptic number.

506535394369 is the 711713-rd square number.

506535394369 is the 355857-th centered octagonal number.

It is an amenable number.

506535394369 is a deficient number, since it is larger than the sum of its proper divisors (711714).

506535394369 is an frugal number, since it uses more digits than its factorization.

506535394369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1423426 (or 711713 counting only the distinct ones).

The product of its (nonzero) digits is 39366000, while the sum is 58.

The spelling of 506535394369 in words is "five hundred six billion, five hundred thirty-five million, three hundred ninety-four thousand, three hundred sixty-nine".