109205819 has 2 divisors, whose sum is σ = 109205820. Its totient is φ = 109205818.

The previous prime is 109205813. The next prime is 109205849. The reversal of 109205819 is 918502901.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 109205819 - 2²⁰ = 108157243 is a prime.

It is a super-2 number, since 2×109205819² = 23851821806921522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (109205813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54602909 + 54602910.

It is an arithmetic number, because the mean of its divisors is an integer number (54602910).

Almost surely, 2^109205819 is an apocalyptic number.

109205819 is a deficient number, since it is larger than the sum of its proper divisors (1).

109205819 is an equidigital number, since it uses as much as digits as its factorization.

109205819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 109205819 is about 10450.1588026211. The cubic root of 109205819 is about 477.9860919840.

The spelling of 109205819 in words is "one hundred nine million, two hundred five thousand, eight hundred nineteen".