102102089 has 2 divisors, whose sum is σ = 102102090. Its totient is φ = 102102088.

The previous prime is 102102071. The next prime is 102102109. The reversal of 102102089 is 980201201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82210489 + 19891600 = 9067^2 + 4460^2 .

It is a cyclic number.

It is not a de Polignac number, because 102102089 - 2¹² = 102097993 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (102102019) 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, 51051044 + 51051045.

It is an arithmetic number, because the mean of its divisors is an integer number (51051045).

Almost surely, 2^102102089 is an apocalyptic number.

It is an amenable number.

102102089 is a deficient number, since it is larger than the sum of its proper divisors (1).

102102089 is an equidigital number, since it uses as much as digits as its factorization.

102102089 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 102102089 is about 10104.5578329781. The cubic root of 102102089 is about 467.3887010445.

The spelling of 102102089 in words is "one hundred two million, one hundred two thousand, eighty-nine".