513391 has 4 divisors (see below), whose sum is σ = 529984. Its totient is φ = 496800.

The previous prime is 513371. The next prime is 513397. The reversal of 513391 is 193315.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-513391 is a prime.

It is a Duffinian number.

513391 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (513397) 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, 8250 + ... + 8311.

It is an arithmetic number, because the mean of its divisors is an integer number (132496).

2⁵¹³³⁹¹ is an apocalyptic number.

513391 is a deficient number, since it is larger than the sum of its proper divisors (16593).

513391 is a wasteful number, since it uses less digits than its factorization.

513391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16592.

The product of its digits is 405, while the sum is 22.

The square root of 513391 is about 716.5130843188. The cubic root of 513391 is about 80.0723824068.

The spelling of 513391 in words is "five hundred thirteen thousand, three hundred ninety-one".