511505 has 4 divisors (see below), whose sum is σ = 613812. Its totient is φ = 409200.

The previous prime is 511487. The next prime is 511507. The reversal of 511505 is 505115.

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 146689 + 364816 = 383^2 + 604^2 .

It is not a de Polignac number, because 511505 - 2¹⁰ = 510481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (511507) 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, 51146 + ... + 51155.

It is an arithmetic number, because the mean of its divisors is an integer number (153453).

2⁵¹¹⁵⁰⁵ is an apocalyptic number.

It is an amenable number.

511505 is a deficient number, since it is larger than the sum of its proper divisors (102307).

511505 is a wasteful number, since it uses less digits than its factorization.

511505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102306.

The product of its (nonzero) digits is 125, while the sum is 17.

The square root of 511505 is about 715.1957773925. The cubic root of 511505 is about 79.9742104371.

The spelling of 511505 in words is "five hundred eleven thousand, five hundred five".