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642217 is a prime number
BaseRepresentation
bin10011100110010101001
31012121221211
42130302221
5131022332
621433121
75313232
oct2346251
91177854
10642217
113a9564
1226b7a1
13196414
1412a089
15ca447
hex9cca9

642217 has 2 divisors, whose sum is σ = 642218. Its totient is φ = 642216.

The previous prime is 642211. The next prime is 642223. The reversal of 642217 is 712246.

642217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (642211) and next prime (642223).

It can be written as a sum of positive squares in only one way, i.e., 434281 + 207936 = 659^2 + 456^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-642217 is a prime.

It is not a weakly prime, because it can be changed into another prime (642211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321108 + 321109.

It is an arithmetic number, because the mean of its divisors is an integer number (321109).

2642217 is an apocalyptic number.

It is an amenable number.

642217 is a deficient number, since it is larger than the sum of its proper divisors (1).

642217 is an equidigital number, since it uses as much as digits as its factorization.

642217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 672, while the sum is 22.

The square root of 642217 is about 801.3844271010. The cubic root of 642217 is about 86.2767808735.

The spelling of 642217 in words is "six hundred forty-two thousand, two hundred seventeen".