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9991254191 is a prime number
BaseRepresentation
bin10010100111000011…
…00111000010101111
3221210022022022010112
421103201213002233
5130430230113231
64331231130235
7502410154652
oct112341470257
927708268115
109991254191
114267891176
121b2a07397b
13c32c47739
146aad27899
153d723192b
hex2538670af

9991254191 has 2 divisors, whose sum is σ = 9991254192. Its totient is φ = 9991254190.

The previous prime is 9991254173. The next prime is 9991254223. The reversal of 9991254191 is 1914521999.

9991254191 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-9991254191 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9991254991) 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, 4995627095 + 4995627096.

It is an arithmetic number, because the mean of its divisors is an integer number (4995627096).

Almost surely, 29991254191 is an apocalyptic number.

9991254191 is a deficient number, since it is larger than the sum of its proper divisors (1).

9991254191 is an equidigital number, since it uses as much as digits as its factorization.

9991254191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 262440, while the sum is 50.

The square root of 9991254191 is about 99956.2613896698. The cubic root of 9991254191 is about 2153.8064310318.

The spelling of 9991254191 in words is "nine billion, nine hundred ninety-one million, two hundred fifty-four thousand, one hundred ninety-one".