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19870099 is a prime number
BaseRepresentation
bin100101111001…
…1000110010011
31101101111122121
41023303012103
520041320344
61545515111
7330615214
oct113630623
941344577
1019870099
1110241777
1267a2a97
134169272
1428d340b
151b27684
hex12f3193

19870099 has 2 divisors, whose sum is σ = 19870100. Its totient is φ = 19870098.

The previous prime is 19870063. The next prime is 19870111. The reversal of 19870099 is 99007891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19870099 - 221 = 17772947 is a prime.

It is not a weakly prime, because it can be changed into another prime (19870999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9935049 + 9935050.

It is an arithmetic number, because the mean of its divisors is an integer number (9935050).

Almost surely, 219870099 is an apocalyptic number.

19870099 is a deficient number, since it is larger than the sum of its proper divisors (1).

19870099 is an equidigital number, since it uses as much as digits as its factorization.

19870099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 43.

The square root of 19870099 is about 4457.5889222763. The cubic root of 19870099 is about 270.8528087823.

The spelling of 19870099 in words is "nineteen million, eight hundred seventy thousand, ninety-nine".