103666609 has 2 divisors, whose sum is σ = 103666610. Its totient is φ = 103666608.

The previous prime is 103666559. The next prime is 103666627. The reversal of 103666609 is 906666301.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64641600 + 39025009 = 8040^2 + 6247^2 .

It is a cyclic number.

It is not a de Polignac number, because 103666609 - 2¹³ = 103658417 is a prime.

It is equal to p_5960359 and since 103666609 and 5960359 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (103666639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51833304 + 51833305.

It is an arithmetic number, because the mean of its divisors is an integer number (51833305).

Almost surely, 2^103666609 is an apocalyptic number.

It is an amenable number.

103666609 is a deficient number, since it is larger than the sum of its proper divisors (1).

103666609 is an equidigital number, since it uses as much as digits as its factorization.

103666609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 103666609 is about 10181.6800676509. The cubic root of 103666609 is about 469.7638907637.

Adding to 103666609 its product of nonzero digits (34992), we get a triangular number (103701601 = T₁₄₄₀₁).

The spelling of 103666609 in words is "one hundred three million, six hundred sixty-six thousand, six hundred nine".