511801 has 2 divisors, whose sum is σ = 511802. Its totient is φ = 511800.

The previous prime is 511793. The next prime is 511811. The reversal of 511801 is 108115.

511801 is nontrivially palindromic in base 8.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 511225 + 576 = 715^2 + 24^2 .

It is a cyclic number.

It is not a de Polignac number, because 511801 - 2³ = 511793 is a prime.

It is not a weakly prime, because it can be changed into another prime (511811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255900 + 255901.

It is an arithmetic number, because the mean of its divisors is an integer number (255901).

2⁵¹¹⁸⁰¹ is an apocalyptic number.

It is an amenable number.

511801 is a deficient number, since it is larger than the sum of its proper divisors (1).

511801 is an equidigital number, since it uses as much as digits as its factorization.

511801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40, while the sum is 16.

The square root of 511801 is about 715.4026838082. The cubic root of 511801 is about 79.9896340736.

Adding to 511801 its reverse (108115), we get a palindrome (619916).

The spelling of 511801 in words is "five hundred eleven thousand, eight hundred one".