109956809 has 2 divisors, whose sum is σ = 109956810. Its totient is φ = 109956808.

The previous prime is 109956779. The next prime is 109956877. The reversal of 109956809 is 908659901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104448400 + 5508409 = 10220^2 + 2347^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-109956809 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (109959809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54978404 + 54978405.

It is an arithmetic number, because the mean of its divisors is an integer number (54978405).

Almost surely, 2^109956809 is an apocalyptic number.

It is an amenable number.

109956809 is a deficient number, since it is larger than the sum of its proper divisors (1).

109956809 is an equidigital number, since it uses as much as digits as its factorization.

109956809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 174960, while the sum is 47.

The square root of 109956809 is about 10486.0292294081. The cubic root of 109956809 is about 479.0792665225.

The spelling of 109956809 in words is "one hundred nine million, nine hundred fifty-six thousand, eight hundred nine".