491 is a Prime Number, Prime(94)
491 = 1 + 2 + 3 + 4 + 56 × 7 + 89
491 = 98 + 76 × 5 + 4 + 32 × 1
491 = 0^4 + 1^8 + 2^6 − 3^9 + 4^7 + 5^5 + 6^1 + 7^0 + 8^3 + 9^2
Number of fractions in Farey series of order 40
Sophie Germain prime p (List): 2p+1 is also prime (983)
491 is an irregular prime, since it divides the numerator of the Bernoulli number B292.
Factors: 1, 491
four hundred ninety-one
Representations, Binary to Hexadecimal:
111101011_2
200012_3
13223_4
3431_5
2135_6
1301_7
753_8
605_9
407_11
34b_12
2ba_13
271_14
22b_15
1eb_16
<--- --->
Undergraduate Texts in Mathematics
Graduate Studies in Mathematics
