102002189 has 2 divisors, whose sum is σ = 102002190. Its totient is φ = 102002188.

The previous prime is 102002179. The next prime is 102002191. The reversal of 102002189 is 981200201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51122500 + 50879689 = 7150^2 + 7133^2 .

It is an emirp because it is prime and its reverse (981200201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 102002189 - 2¹² = 101998093 is a prime.

It is a Sophie Germain prime.

Together with 102002191, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102002119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51001094 + 51001095.

It is an arithmetic number, because the mean of its divisors is an integer number (51001095).

Almost surely, 2^102002189 is an apocalyptic number.

It is an amenable number.

102002189 is a deficient number, since it is larger than the sum of its proper divisors (1).

102002189 is an equidigital number, since it uses as much as digits as its factorization.

102002189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 102002189 is about 10099.6133094292. The cubic root of 102002189 is about 467.2362152063.

The spelling of 102002189 in words is "one hundred two million, two thousand, one hundred eighty-nine".