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19553921 is a prime number
BaseRepresentation
bin100101010010…
…1111010000001
31100210102221022
41022211322001
520001211141
61535035225
7325130342
oct112457201
940712838
1019553921
1110046172
12666bb15
13408838a
1428500c9
151ab3b4b
hex12a5e81

19553921 has 2 divisors, whose sum is σ = 19553922. Its totient is φ = 19553920.

The previous prime is 19553909. The next prime is 19553951. The reversal of 19553921 is 12935591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14554225 + 4999696 = 3815^2 + 2236^2 .

It is a cyclic number.

It is not a de Polignac number, because 19553921 - 26 = 19553857 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19553951) 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, 9776960 + 9776961.

It is an arithmetic number, because the mean of its divisors is an integer number (9776961).

Almost surely, 219553921 is an apocalyptic number.

It is an amenable number.

19553921 is a deficient number, since it is larger than the sum of its proper divisors (1).

19553921 is an equidigital number, since it uses as much as digits as its factorization.

19553921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12150, while the sum is 35.

The square root of 19553921 is about 4421.9815693872. The cubic root of 19553921 is about 269.4084947664.

The spelling of 19553921 in words is "nineteen million, five hundred fifty-three thousand, nine hundred twenty-one".