511023 has 4 divisors (see below), whose sum is σ = 681368. Its totient is φ = 340680.

The previous prime is 511019. The next prime is 511033. The reversal of 511023 is 320115.

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

It is not a de Polignac number, because 511023 - 2² = 511019 is a prime.

It is a super-2 number, since 2×511023² = 522289013058, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

511023 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 511023.

It is not an unprimeable number, because it can be changed into a prime (511013) 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, 85168 + ... + 85173.

It is an arithmetic number, because the mean of its divisors is an integer number (170342).

2⁵¹¹⁰²³ is an apocalyptic number.

511023 is a deficient number, since it is larger than the sum of its proper divisors (170345).

511023 is a wasteful number, since it uses less digits than its factorization.

511023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170344.

The product of its (nonzero) digits is 30, while the sum is 12.

The square root of 511023 is about 714.8587273021. The cubic root of 511023 is about 79.9490821824.

Adding to 511023 its reverse (320115), we get a palindrome (831138).

The spelling of 511023 in words is "five hundred eleven thousand, twenty-three".