80621 has 2 divisors, whose sum is σ = 80622. Its totient is φ = 80620.
The previous prime is 80611. The next prime is 80627. The reversal of 80621 is 12608.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 44521 + 36100 = 211^2 + 190^2 .
It is a cyclic number.
It is not a de Polignac number, because 80621 - 26 = 80557 is a prime.
It is a Chen prime.
It is a self number, because there is not a number n which added to its sum of digits gives 80621.
It is a congruent number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 80621.
It is not a weakly prime, because it can be changed into another prime (80627) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40310 + 40311.
It is an arithmetic number, because the mean of its divisors is an integer number (40311).
280621 is an apocalyptic number.
It is an amenable number.
80621 is a deficient number, since it is larger than the sum of its proper divisors (1).
80621 is an equidigital number, since it uses as much as digits as its factorization.
80621 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 96, while the sum is 17.
The square root of 80621 is about 283.9383735954. The cubic root of 80621 is about 43.1998985480.
The spelling of 80621 in words is "eighty thousand, six hundred twenty-one".
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