102020189 has 2 divisors, whose sum is σ = 102020190. Its totient is φ = 102020188.

The previous prime is 102020183. The next prime is 102020227. The reversal of 102020189 is 981020201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85414564 + 16605625 = 9242^2 + 4075^2 .

It is a cyclic number.

It is not a de Polignac number, because 102020189 - 2⁸ = 102019933 is a prime.

It is a Sophie Germain 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 (102020183) 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, 51010094 + 51010095.

It is an arithmetic number, because the mean of its divisors is an integer number (51010095).

Almost surely, 2^102020189 is an apocalyptic number.

It is an amenable number.

102020189 is a deficient number, since it is larger than the sum of its proper divisors (1).

102020189 is an equidigital number, since it uses as much as digits as its factorization.

102020189 is an odious number, because the sum of its binary digits is odd.

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

The square root of 102020189 is about 10100.5043933459. The cubic root of 102020189 is about 467.2636974832.

The spelling of 102020189 in words is "one hundred two million, twenty thousand, one hundred eighty-nine".