102102109 has 2 divisors, whose sum is σ = 102102110. Its totient is φ = 102102108.

The previous prime is 102102089. The next prime is 102102139. The reversal of 102102109 is 901201201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53144100 + 48958009 = 7290^2 + 6997^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102102109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 102102092 and 102102101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102102139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51051054 + 51051055.

It is an arithmetic number, because the mean of its divisors is an integer number (51051055).

Almost surely, 2^102102109 is an apocalyptic number.

It is an amenable number.

102102109 is a deficient number, since it is larger than the sum of its proper divisors (1).

102102109 is an equidigital number, since it uses as much as digits as its factorization.

102102109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 102102109 is about 10104.5588226305. The cubic root of 102102109 is about 467.3887315622.

The spelling of 102102109 in words is "one hundred two million, one hundred two thousand, one hundred nine".