102104909 has 2 divisors, whose sum is σ = 102104910. Its totient is φ = 102104908.

The previous prime is 102104861. The next prime is 102104921. The reversal of 102104909 is 909401201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100060009 + 2044900 = 10003^2 + 1430^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102104909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102104929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51052454 + 51052455.

It is an arithmetic number, because the mean of its divisors is an integer number (51052455).

Almost surely, 2^102104909 is an apocalyptic number.

It is an amenable number.

102104909 is a deficient number, since it is larger than the sum of its proper divisors (1).

102104909 is an equidigital number, since it uses as much as digits as its factorization.

102104909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 102104909 is about 10104.6973730043. The cubic root of 102104909 is about 467.3930040058.

The spelling of 102104909 in words is "one hundred two million, one hundred four thousand, nine hundred nine".