805684013 has 4 divisors (see below), whose sum is σ = 806225148. Its totient is φ = 805142880.

The previous prime is 805684001. The next prime is 805684021. The reversal of 805684013 is 310486508.

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 615188809 + 190495204 = 24803^2 + 13802^2 .

It is a cyclic number.

It is not a de Polignac number, because 805684013 - 2⁸ = 805683757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (805684613) 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, 268328 + ... + 271313.

It is an arithmetic number, because the mean of its divisors is an integer number (201556287).

Almost surely, 2^805684013 is an apocalyptic number.

It is an amenable number.

805684013 is a deficient number, since it is larger than the sum of its proper divisors (541135).

805684013 is a wasteful number, since it uses less digits than its factorization.

805684013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541134.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 805684013 is about 28384.5735039299. The cubic root of 805684013 is about 930.5111511573.

The spelling of 805684013 in words is "eight hundred five million, six hundred eighty-four thousand, thirteen".