517391 has 6 divisors (see below), whose sum is σ = 601920. Its totient is φ = 443436.

The previous prime is 517381. The next prime is 517393. The reversal of 517391 is 193715.

It is not a de Polignac number, because 517391 - 2¹⁸ = 255247 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 517391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (517393) 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, 5231 + ... + 5328.

It is an arithmetic number, because the mean of its divisors is an integer number (100320).

2⁵¹⁷³⁹¹ is an apocalyptic number.

517391 is a deficient number, since it is larger than the sum of its proper divisors (84529).

517391 is a wasteful number, since it uses less digits than its factorization.

517391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10573 (or 10566 counting only the distinct ones).

The product of its digits is 945, while the sum is 26.

The square root of 517391 is about 719.2989642701. The cubic root of 517391 is about 80.2798014981.

The spelling of 517391 in words is "five hundred seventeen thousand, three hundred ninety-one".