My rc heli has this motor ot-rk-370ph-5133/49. I found this link
https://www.sinoning.com/product/small-mini-370-dc-motor-3v-12v-46000rpm-high-speed-strong-large-torque-ot-rk-370ph-5133-electric-motor-diy-car-model/which mentions the spec. Not sure I'll find this motor in India so looking for a similar specd replacement.
These days motors have a KV unit which I'm not sure how to compare to RPM.
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Want to replace 3.7v, 46000rpm motor in my fxd 68688