512206534781 has 4 divisors (see below), whose sum is σ = 512320845564. Its totient is φ = 512092224000.

The previous prime is 512206534757. The next prime is 512206534799. The reversal of 512206534781 is 187435602215.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 388770955225 + 123435579556 = 623515^2 + 351334^2 .

It is a cyclic number.

It is not a de Polignac number, because 512206534781 - 2¹⁸ = 512206272637 is a prime.

It is a super-2 number, since 2×512206534781² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (512206564781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57148670 + ... + 57157631.

It is an arithmetic number, because the mean of its divisors is an integer number (128080211391).

Almost surely, 2^512206534781 is an apocalyptic number.

It is an amenable number.

512206534781 is a deficient number, since it is larger than the sum of its proper divisors (114310783).

512206534781 is a wasteful number, since it uses less digits than its factorization.

512206534781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114310782.

The product of its (nonzero) digits is 403200, while the sum is 44.

The spelling of 512206534781 in words is "five hundred twelve billion, two hundred six million, five hundred thirty-four thousand, seven hundred eighty-one".