103406209 has 2 divisors, whose sum is σ = 103406210. Its totient is φ = 103406208.

The previous prime is 103406203. The next prime is 103406249. The reversal of 103406209 is 902604301.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79121025 + 24285184 = 8895^2 + 4928^2 .

It is an emirp because it is prime and its reverse (902604301) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 103406209 - 2³ = 103406201 is a prime.

It is not a weakly prime, because it can be changed into another prime (103406201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51703104 + 51703105.

It is an arithmetic number, because the mean of its divisors is an integer number (51703105).

Almost surely, 2^103406209 is an apocalyptic number.

It is an amenable number.

103406209 is a deficient number, since it is larger than the sum of its proper divisors (1).

103406209 is an equidigital number, since it uses as much as digits as its factorization.

103406209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 103406209 is about 10168.8843537529. The cubic root of 103406209 is about 469.3702278943.

The spelling of 103406209 in words is "one hundred three million, four hundred six thousand, two hundred nine".