513811 has 4 divisors (see below), whose sum is σ = 518472. Its totient is φ = 509152.

The previous prime is 513781. The next prime is 513829. The reversal of 513811 is 118315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 118315 = 5 ⋅23663.

It is a cyclic number.

It is not a de Polignac number, because 513811 - 2⁷ = 513683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (513841) 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, 2161 + ... + 2386.

It is an arithmetic number, because the mean of its divisors is an integer number (129618).

2⁵¹³⁸¹¹ is an apocalyptic number.

513811 is a deficient number, since it is larger than the sum of its proper divisors (4661).

513811 is a wasteful number, since it uses less digits than its factorization.

513811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4660.

The product of its digits is 120, while the sum is 19.

The square root of 513811 is about 716.8061104650. The cubic root of 513811 is about 80.0942119245.

The spelling of 513811 in words is "five hundred thirteen thousand, eight hundred eleven".