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642281 is a prime number
BaseRepresentation
bin10011100110011101001
31012122001012
42130303221
5131023111
621433305
75313353
oct2346351
91178035
10642281
113a9612
1226b835
13196463
1412a0d3
15ca48b
hex9cce9

642281 has 2 divisors, whose sum is σ = 642282. Its totient is φ = 642280.

The previous prime is 642253. The next prime is 642359. The reversal of 642281 is 182246.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 469225 + 173056 = 685^2 + 416^2 .

It is a cyclic number.

It is not a de Polignac number, because 642281 - 26 = 642217 is a prime.

It is a super-2 number, since 2×6422812 = 825049765922, which contains 22 as substring.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 642281.

It is not a weakly prime, because it can be changed into another prime (642211) 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, 321140 + 321141.

It is an arithmetic number, because the mean of its divisors is an integer number (321141).

2642281 is an apocalyptic number.

It is an amenable number.

642281 is a deficient number, since it is larger than the sum of its proper divisors (1).

642281 is an equidigital number, since it uses as much as digits as its factorization.

642281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 768, while the sum is 23.

The square root of 642281 is about 801.4243570045. The cubic root of 642281 is about 86.2796467432.

The spelling of 642281 in words is "six hundred forty-two thousand, two hundred eighty-one".