103902809 has 2 divisors, whose sum is σ = 103902810. Its totient is φ = 103902808.

The previous prime is 103902797. The next prime is 103902817. The reversal of 103902809 is 908209301.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88887184 + 15015625 = 9428^2 + 3875^2 .

It is a cyclic number.

It is not a de Polignac number, because 103902809 - 2¹⁶ = 103837273 is a prime.

It is not a weakly prime, because it can be changed into another prime (103902859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51951404 + 51951405.

It is an arithmetic number, because the mean of its divisors is an integer number (51951405).

Almost surely, 2^103902809 is an apocalyptic number.

It is an amenable number.

103902809 is a deficient number, since it is larger than the sum of its proper divisors (1).

103902809 is an equidigital number, since it uses as much as digits as its factorization.

103902809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 103902809 is about 10193.2727325428. The cubic root of 103902809 is about 470.1203992137.

The spelling of 103902809 in words is "one hundred three million, nine hundred two thousand, eight hundred nine".