102345209 has 2 divisors, whose sum is σ = 102345210. Its totient is φ = 102345208.

The previous prime is 102345169. The next prime is 102345281. The reversal of 102345209 is 902543201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51265600 + 51079609 = 7160^2 + 7147^2 .

It is a cyclic number.

It is not a de Polignac number, because 102345209 - 2⁸ = 102344953 is a prime.

It is not a weakly prime, because it can be changed into another prime (102345709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51172604 + 51172605.

It is an arithmetic number, because the mean of its divisors is an integer number (51172605).

Almost surely, 2^102345209 is an apocalyptic number.

It is an amenable number.

102345209 is a deficient number, since it is larger than the sum of its proper divisors (1).

102345209 is an equidigital number, since it uses as much as digits as its factorization.

102345209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 102345209 is about 10116.5808947490. The cubic root of 102345209 is about 467.7593805939.

The spelling of 102345209 in words is "one hundred two million, three hundred forty-five thousand, two hundred nine".