511321 has 4 divisors (see below), whose sum is σ = 513252. Its totient is φ = 509392.

The previous prime is 511297. The next prime is 511327. The reversal of 511321 is 123115.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 123115 = 5 ⋅24623.

It can be written as a sum of positive squares in 2 ways, for example, as 151321 + 360000 = 389^2 + 600^2 .

It is a cyclic number.

It is not a de Polignac number, because 511321 - 2⁵ = 511289 is a prime.

It is a super-2 number, since 2×511321² = 522898330082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (511327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 490 + ... + 1123.

It is an arithmetic number, because the mean of its divisors is an integer number (128313).

2⁵¹¹³²¹ is an apocalyptic number.

It is an amenable number.

511321 is a deficient number, since it is larger than the sum of its proper divisors (1931).

511321 is a wasteful number, since it uses less digits than its factorization.

511321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1930.

The product of its digits is 30, while the sum is 13.

The square root of 511321 is about 715.0671297158. The cubic root of 511321 is about 79.9646197720.

Adding to 511321 its reverse (123115), we get a palindrome (634436).

The spelling of 511321 in words is "five hundred eleven thousand, three hundred twenty-one".