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18020810191 is a prime number
BaseRepresentation
bin10000110010000111…
…111011110111001111
31201111220100000020111
4100302013323313033
5243401311411231
612140104300451
71205400234136
oct206207736717
951456300214
1018020810191
11770830646a
1235ab171727
1319126386c7
14c2d4c691d
157071194b1
hex4321fbdcf

18020810191 has 2 divisors, whose sum is σ = 18020810192. Its totient is φ = 18020810190.

The previous prime is 18020810153. The next prime is 18020810207. The reversal of 18020810191 is 19101802081.

It is a strong prime.

It is an emirp because it is prime and its reverse (19101802081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18020810191 - 213 = 18020801999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18020810111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9010405095 + 9010405096.

It is an arithmetic number, because the mean of its divisors is an integer number (9010405096).

Almost surely, 218020810191 is an apocalyptic number.

18020810191 is a deficient number, since it is larger than the sum of its proper divisors (1).

18020810191 is an equidigital number, since it uses as much as digits as its factorization.

18020810191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 31.

The spelling of 18020810191 in words is "eighteen billion, twenty million, eight hundred ten thousand, one hundred ninety-one".