521317 has 2 divisors, whose sum is σ = 521318. Its totient is φ = 521316.
The previous prime is 521309. The next prime is 521329. The reversal of 521317 is 713125.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 516961 + 4356 = 719^2 + 66^2 .
It is a cyclic number.
It is not a de Polignac number, because 521317 - 23 = 521309 is a prime.
It is a Chen prime.
It is a junction number, because it is equal to n+sod(n) for n = 521294 and 521303.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (521357) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260658 + 260659.
It is an arithmetic number, because the mean of its divisors is an integer number (260659).
2521317 is an apocalyptic number.
It is an amenable number.
521317 is a deficient number, since it is larger than the sum of its proper divisors (1).
521317 is an equidigital number, since it uses as much as digits as its factorization.
521317 is an evil number, because the sum of its binary digits is even.
The product of its digits is 210, while the sum is 19.
The square root of 521317 is about 722.0228528239. The cubic root of 521317 is about 80.4823463468.
It can be divided in two parts, 521 and 317, that added together give a palindrome (838).
The spelling of 521317 in words is "five hundred twenty-one thousand, three hundred seventeen".
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