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82921 = 101821
BaseRepresentation
bin10100001111101001
311012202011
4110033221
510123141
61435521
7463516
oct241751
9135664
1082921
1157333
123bba1
132b987
142230d
1519881
hex143e9

82921 has 4 divisors (see below), whose sum is σ = 83844. Its totient is φ = 82000.

The previous prime is 82913. The next prime is 82939. The reversal of 82921 is 12928.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 55696 + 27225 = 236^2 + 165^2 .

It is a cyclic number.

It is not a de Polignac number, because 82921 - 23 = 82913 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 82892 and 82901.

It is not an unprimeable number, because it can be changed into a prime (82981) 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, 310 + ... + 511.

It is an arithmetic number, because the mean of its divisors is an integer number (20961).

282921 is an apocalyptic number.

It is an amenable number.

82921 is a deficient number, since it is larger than the sum of its proper divisors (923).

82921 is a wasteful number, since it uses less digits than its factorization.

82921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 922.

The product of its digits is 288, while the sum is 22.

The square root of 82921 is about 287.9600666759. The cubic root of 82921 is about 43.6068628201.

The spelling of 82921 in words is "eighty-two thousand, nine hundred twenty-one".

Divisors: 1 101 821 82921