513987 has 4 divisors (see below), whose sum is σ = 685320. Its totient is φ = 342656.

The previous prime is 513977. The next prime is 513991. The reversal of 513987 is 789315.

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

It is a cyclic number.

It is not a de Polignac number, because 513987 - 2⁶ = 513923 is a prime.

It is a D-number.

513987 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 513987.

It is not an unprimeable number, because it can be changed into a prime (513917) 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, 85662 + ... + 85667.

It is an arithmetic number, because the mean of its divisors is an integer number (171330).

2⁵¹³⁹⁸⁷ is an apocalyptic number.

513987 is a deficient number, since it is larger than the sum of its proper divisors (171333).

513987 is a wasteful number, since it uses less digits than its factorization.

513987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171332.

The product of its digits is 7560, while the sum is 33.

The square root of 513987 is about 716.9288667643. The cubic root of 513987 is about 80.1033559951.

The spelling of 513987 in words is "five hundred thirteen thousand, nine hundred eighty-seven".