821263 has 2 divisors, whose sum is σ = 821264. Its totient is φ = 821262.
The previous prime is 821209. The next prime is 821281. The reversal of 821263 is 362128.
It is a strong prime.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-821263 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (821063) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410631 + 410632.
It is an arithmetic number, because the mean of its divisors is an integer number (410632).
2821263 is an apocalyptic number.
821263 is a deficient number, since it is larger than the sum of its proper divisors (1).
821263 is an equidigital number, since it uses as much as digits as its factorization.
821263 is an evil number, because the sum of its binary digits is even.
The product of its digits is 576, while the sum is 22.
The square root of 821263 is about 906.2356205756. The cubic root of 821263 is about 93.6470466850.
The spelling of 821263 in words is "eight hundred twenty-one thousand, two hundred sixty-three".
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