512991 has 6 divisors (see below), whose sum is σ = 741000. Its totient is φ = 341988.

The previous prime is 512989. The next prime is 512999. The reversal of 512991 is 199215.

It is a happy number.

It is not a de Polignac number, because 512991 - 2¹ = 512989 is a prime.

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 512991.

It is not an unprimeable number, because it can be changed into a prime (512999) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28491 + ... + 28508.

It is an arithmetic number, because the mean of its divisors is an integer number (123500).

2⁵¹²⁹⁹¹ is an apocalyptic number.

512991 is a deficient number, since it is larger than the sum of its proper divisors (228009).

512991 is a wasteful number, since it uses less digits than its factorization.

512991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57005 (or 57002 counting only the distinct ones).

The product of its digits is 810, while the sum is 27.

The square root of 512991 is about 716.2339003426. The cubic root of 512991 is about 80.0515813183.

It can be divided in two parts, 5 and 12991, that added together give a square (12996 = 114²).

The spelling of 512991 in words is "five hundred twelve thousand, nine hundred ninety-one".