103440209 has 2 divisors, whose sum is σ = 103440210. Its totient is φ = 103440208.

The previous prime is 103440193. The next prime is 103440221. The reversal of 103440209 is 902044301.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100300225 + 3139984 = 10015^2 + 1772^2 .

It is an emirp because it is prime and its reverse (902044301) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 103440209 - 2⁴ = 103440193 is a prime.

It is not a weakly prime, because it can be changed into another prime (103440229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51720104 + 51720105.

It is an arithmetic number, because the mean of its divisors is an integer number (51720105).

Almost surely, 2^103440209 is an apocalyptic number.

It is an amenable number.

103440209 is a deficient number, since it is larger than the sum of its proper divisors (1).

103440209 is an equidigital number, since it uses as much as digits as its factorization.

103440209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 103440209 is about 10170.5559828359. Note that the first 3 decimals coincide. The cubic root of 103440209 is about 469.4216652924.

The spelling of 103440209 in words is "one hundred three million, four hundred forty thousand, two hundred nine".