513869 has 4 divisors (see below), whose sum is σ = 515580. Its totient is φ = 512160.

The previous prime is 513841. The next prime is 513871. The reversal of 513869 is 968315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 968315 = 5 ⋅193663.

It can be written as a sum of positive squares in 2 ways, for example, as 315844 + 198025 = 562^2 + 445^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-513869 is a prime.

It is a super-2 number, since 2×513869² = 528122698322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon 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 513869.

It is not an unprimeable number, because it can be changed into a prime (513829) 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 in 3 ways as a sum of consecutive naturals, for example, 272 + ... + 1049.

It is an arithmetic number, because the mean of its divisors is an integer number (128895).

2⁵¹³⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

513869 is a deficient number, since it is larger than the sum of its proper divisors (1711).

513869 is a wasteful number, since it uses less digits than its factorization.

513869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1710.

The product of its digits is 6480, while the sum is 32.

The square root of 513869 is about 716.8465665678. The cubic root of 513869 is about 80.0972255421.

The spelling of 513869 in words is "five hundred thirteen thousand, eight hundred sixty-nine".