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1989517 is a prime number
BaseRepresentation
bin111100101101110001101
310202002002211
413211232031
51002131032
6110350421
722624225
oct7455615
93662084
101989517
111139832
127bb411
1354873a
1439b085
15294747
hex1e5b8d

1989517 has 2 divisors, whose sum is σ = 1989518. Its totient is φ = 1989516.

The previous prime is 1989499. The next prime is 1989551. The reversal of 1989517 is 7159891.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1190281 + 799236 = 1091^2 + 894^2 .

It is an emirp because it is prime and its reverse (7159891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1989517 - 215 = 1956749 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1989517.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1989217) 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, 994758 + 994759.

It is an arithmetic number, because the mean of its divisors is an integer number (994759).

21989517 is an apocalyptic number.

It is an amenable number.

1989517 is a deficient number, since it is larger than the sum of its proper divisors (1).

1989517 is an equidigital number, since it uses as much as digits as its factorization.

1989517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 40.

The square root of 1989517 is about 1410.5023927665. The cubic root of 1989517 is about 125.7715900571.

The spelling of 1989517 in words is "one million, nine hundred eighty-nine thousand, five hundred seventeen".