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19408121 is a prime number
BaseRepresentation
bin100101000001…
…0010011111001
31100112000221022
41022002103321
514432024441
61531552225
7323652305
oct112022371
940460838
1019408121
11aa56677
1265bb675
134036bc5
142812d05
151a8584b
hex12824f9

19408121 has 2 divisors, whose sum is σ = 19408122. Its totient is φ = 19408120.

The previous prime is 19408111. The next prime is 19408127. The reversal of 19408121 is 12180491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19404025 + 4096 = 4405^2 + 64^2 .

It is a cyclic number.

It is not a de Polignac number, because 19408121 - 210 = 19407097 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (19408127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9704060 + 9704061.

It is an arithmetic number, because the mean of its divisors is an integer number (9704061).

Almost surely, 219408121 is an apocalyptic number.

It is an amenable number.

19408121 is a deficient number, since it is larger than the sum of its proper divisors (1).

19408121 is an equidigital number, since it uses as much as digits as its factorization.

19408121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 19408121 is about 4405.4649016874. The cubic root of 19408121 is about 268.7372262903.

The spelling of 19408121 in words is "nineteen million, four hundred eight thousand, one hundred twenty-one".