513745 has 8 divisors (see below), whose sum is σ = 633384. Its totient is φ = 399744.

The previous prime is 513739. The next prime is 513749. The reversal of 513745 is 547315.

It can be written as a sum of positive squares in 4 ways, for example, as 63504 + 450241 = 252^2 + 671^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-513745 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (513749) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1204 + ... + 1573.

It is an arithmetic number, because the mean of its divisors is an integer number (79173).

2⁵¹³⁷⁴⁵ is an apocalyptic number.

It is an amenable number.

513745 is a deficient number, since it is larger than the sum of its proper divisors (119639).

513745 is a wasteful number, since it uses less digits than its factorization.

513745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2819.

The product of its digits is 2100, while the sum is 25.

The square root of 513745 is about 716.7600714326. The cubic root of 513745 is about 80.0907823597.

The spelling of 513745 in words is "five hundred thirteen thousand, seven hundred forty-five".