109019909 has 2 divisors, whose sum is σ = 109019910. Its totient is φ = 109019908.

The previous prime is 109019893. The next prime is 109019917. The reversal of 109019909 is 909910901.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77827684 + 31192225 = 8822^2 + 5585^2 .

It is a cyclic number.

It is not a de Polignac number, because 109019909 - 2⁴ = 109019893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109019959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54509954 + 54509955.

It is an arithmetic number, because the mean of its divisors is an integer number (54509955).

Almost surely, 2^109019909 is an apocalyptic number.

It is an amenable number.

109019909 is a deficient number, since it is larger than the sum of its proper divisors (1).

109019909 is an equidigital number, since it uses as much as digits as its factorization.

109019909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6561, while the sum is 38.

The square root of 109019909 is about 10441.2599335521. The cubic root of 109019909 is about 477.7146996448.

The spelling of 109019909 in words is "one hundred nine million, nineteen thousand, nine hundred nine".