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9991254157 is a prime number
BaseRepresentation
bin10010100111000011…
…00111000010001101
3221210022022022002021
421103201213002031
5130430230113112
64331231130141
7502410154603
oct112341470215
927708268067
109991254157
114267891145
121b2a073951
13c32c47711
146aad27873
153d7231907
hex25386708d

9991254157 has 2 divisors, whose sum is σ = 9991254158. Its totient is φ = 9991254156.

The previous prime is 9991254113. The next prime is 9991254167. The reversal of 9991254157 is 7514521999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9962834596 + 28419561 = 99814^2 + 5331^2 .

It is a cyclic number.

It is not a de Polignac number, because 9991254157 - 231 = 7843770509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9991254167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4995627078 + 4995627079.

It is an arithmetic number, because the mean of its divisors is an integer number (4995627079).

Almost surely, 29991254157 is an apocalyptic number.

It is an amenable number.

9991254157 is a deficient number, since it is larger than the sum of its proper divisors (1).

9991254157 is an equidigital number, since it uses as much as digits as its factorization.

9991254157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1020600, while the sum is 52.

The square root of 9991254157 is about 99956.2612195954. The cubic root of 9991254157 is about 2153.8064285886.

The spelling of 9991254157 in words is "nine billion, nine hundred ninety-one million, two hundred fifty-four thousand, one hundred fifty-seven".