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309999997 is a prime number
BaseRepresentation
bin10010011110100…
…011100101111101
3210121022122001101
4102132203211331
51113324444442
650432213101
710452646036
oct2236434575
9717278041
10309999997
11149a9464a
128799a191
134c2bc668
142d257a8d
151c336cb7
hex127a397d

309999997 has 2 divisors, whose sum is σ = 309999998. Its totient is φ = 309999996.

The previous prime is 309999979. The next prime is 310000037. The reversal of 309999997 is 799999903.

Together with previous prime (309999979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 194351481 + 115648516 = 13941^2 + 10754^2 .

It is a cyclic number.

It is not a de Polignac number, because 309999997 - 27 = 309999869 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (309999917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154999998 + 154999999.

It is an arithmetic number, because the mean of its divisors is an integer number (154999999).

Almost surely, 2309999997 is an apocalyptic number.

It is an amenable number.

309999997 is a deficient number, since it is larger than the sum of its proper divisors (1).

309999997 is an equidigital number, since it uses as much as digits as its factorization.

309999997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11160261, while the sum is 64.

The square root of 309999997 is about 17606.8167764647. The cubic root of 309999997 is about 676.7899430275.

The spelling of 309999997 in words is "three hundred nine million, nine hundred ninety-nine thousand, nine hundred ninety-seven".