|Cardinal||one hundred thirty-seven|
(one hundred thirty-seventh)
137 (one hundred [and] thirty-seven) is the natural number following 136 and preceding 138.
Using two radii to divide a circle according to the golden ratio yields sectors of approximately 137° (the golden angle) and 222°.
1/137 = 0.00729927007299270072992700..., its period value is palindromic and has a period length of only 8. 1/137 was once believed to be the exact value of the fine-structure constant.