805513 has 4 divisors (see below), whose sum is σ = 807940. Its totient is φ = 803088.

The previous prime is 805507. The next prime is 805517. The reversal of 805513 is 315508.

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

It can be written as a sum of positive squares in 2 ways, for example, as 710649 + 94864 = 843^2 + 308^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-805513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (805517) 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, 618 + ... + 1411.

It is an arithmetic number, because the mean of its divisors is an integer number (201985).

2⁸⁰⁵⁵¹³ is an apocalyptic number.

It is an amenable number.

805513 is a deficient number, since it is larger than the sum of its proper divisors (2427).

805513 is a wasteful number, since it uses less digits than its factorization.

805513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2426.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 805513 is about 897.5037604378. The cubic root of 805513 is about 93.0445310306.

The spelling of 805513 in words is "eight hundred five thousand, five hundred thirteen".