SymPy Gamma

SymPy:

summation (1/2**i,(i,0,oo ))

$\sum_{i=0}^{\infty} 2^{- i}$

Result:

$2$

Digits in base-10 expansion of number:

len(str(2))

Factors less than 100:

factorint(2, limit=100)

Factorization Diagram:

factorint(2, limit=256)

See what Wolfram|Alpha has to say.

Experiment with SymPy at SymPy Live.