2.51 million written in number form is 2,510,000
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251 million in Scientific Notation = 2.51 x 108
251 = two hundred fifty-one.
It is a prime number, and therefore not a composite number.251 is prime.
37, 251, 285 = thirty-seven million, two hundred fifty-one thousand, two hundred eighty-five.
Just 1 and 251 because it is a prime number.