511006561 has 4 divisors (see below), whose sum is σ = 550314772. Its totient is φ = 471698352.

The previous prime is 511006537. The next prime is 511006579. The reversal of 511006561 is 165600115.

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 105185536 + 405821025 = 10256^2 + 20145^2 .

It is a cyclic number.

It is not a de Polignac number, because 511006561 - 2¹⁷ = 510875489 is a prime.

It is a super-2 number, since 2×511006561² = 522255410770093442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (511006261) 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 in 3 ways as a sum of consecutive naturals, for example, 19654086 + ... + 19654111.

It is an arithmetic number, because the mean of its divisors is an integer number (137578693).

Almost surely, 2^511006561 is an apocalyptic number.

It is an amenable number.

511006561 is a deficient number, since it is larger than the sum of its proper divisors (39308211).

511006561 is a wasteful number, since it uses less digits than its factorization.

511006561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39308210.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 511006561 is about 22605.4542312248. The cubic root of 511006561 is about 799.4822488436.

Adding to 511006561 its reverse (165600115), we get a palindrome (676606676).

The spelling of 511006561 in words is "five hundred eleven million, six thousand, five hundred sixty-one".