102390209 has 2 divisors, whose sum is σ = 102390210. Its totient is φ = 102390208.

The previous prime is 102390203. The next prime is 102390247. The reversal of 102390209 is 902093201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94633984 + 7756225 = 9728^2 + 2785^2 .

It is an emirp because it is prime and its reverse (902093201) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102390209 is a prime.

It is not a weakly prime, because it can be changed into another prime (102390203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51195104 + 51195105.

It is an arithmetic number, because the mean of its divisors is an integer number (51195105).

Almost surely, 2^102390209 is an apocalyptic number.

It is an amenable number.

102390209 is a deficient number, since it is larger than the sum of its proper divisors (1).

102390209 is an equidigital number, since it uses as much as digits as its factorization.

102390209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 102390209 is about 10118.8047219027. The cubic root of 102390209 is about 467.8279266713.

The spelling of 102390209 in words is "one hundred two million, three hundred ninety thousand, two hundred nine".