103809661 has 2 divisors, whose sum is σ = 103809662. Its totient is φ = 103809660.

The previous prime is 103809583. The next prime is 103809709. The reversal of 103809661 is 166908301.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80102500 + 23707161 = 8950^2 + 4869^2 .

It is a cyclic number.

It is not a de Polignac number, because 103809661 - 2¹⁹ = 103285373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (103809061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51904830 + 51904831.

It is an arithmetic number, because the mean of its divisors is an integer number (51904831).

Almost surely, 2^103809661 is an apocalyptic number.

It is an amenable number.

103809661 is a deficient number, since it is larger than the sum of its proper divisors (1).

103809661 is an equidigital number, since it uses as much as digits as its factorization.

103809661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 103809661 is about 10188.7026161332. The cubic root of 103809661 is about 469.9798708748.

The spelling of 103809661 in words is "one hundred three million, eight hundred nine thousand, six hundred sixty-one".