Search a number
-
+
19999549 is a prime number
BaseRepresentation
bin100110001001…
…0101100111101
31101122002020001
41030102230331
520104441144
61552354301
7331664503
oct114225475
941562201
1019999549
111031aa59
126845991
1341b316b
142928673
151b50bd4
hex1312b3d

19999549 has 2 divisors, whose sum is σ = 19999550. Its totient is φ = 19999548.

The previous prime is 19999547. The next prime is 19999583. The reversal of 19999549 is 94599991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10432900 + 9566649 = 3230^2 + 3093^2 .

It is a cyclic number.

It is not a de Polignac number, because 19999549 - 21 = 19999547 is a prime.

Together with 19999547, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 19999549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19999543) 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, 9999774 + 9999775.

It is an arithmetic number, because the mean of its divisors is an integer number (9999775).

Almost surely, 219999549 is an apocalyptic number.

It is an amenable number.

19999549 is a deficient number, since it is larger than the sum of its proper divisors (1).

19999549 is an equidigital number, since it uses as much as digits as its factorization.

19999549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1180980, while the sum is 55.

The square root of 19999549 is about 4472.0855313824. The cubic root of 19999549 is about 271.4397213069.

The spelling of 19999549 in words is "nineteen million, nine hundred ninety-nine thousand, five hundred forty-nine".