56813 has 2 divisors, whose sum is σ = 56814. Its totient is φ = 56812.
The previous prime is 56809. The next prime is 56821. The reversal of 56813 is 31865.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 56644 + 169 = 238^2 + 13^2 .
It is a cyclic number.
It is not a de Polignac number, because 56813 - 22 = 56809 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (56843) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28406 + 28407.
It is an arithmetic number, because the mean of its divisors is an integer number (28407).
256813 is an apocalyptic number.
It is an amenable number.
56813 is a deficient number, since it is larger than the sum of its proper divisors (1).
56813 is an equidigital number, since it uses as much as digits as its factorization.
56813 is an evil number, because the sum of its binary digits is even.
The product of its digits is 720, while the sum is 23.
The square root of 56813 is about 238.3547775900. The cubic root of 56813 is about 38.4428792568.
The spelling of 56813 in words is "fifty-six thousand, eight hundred thirteen".
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