109209209 has 4 divisors (see below), whose sum is σ = 109231104. Its totient is φ = 109187316.

The previous prime is 109209167. The next prime is 109209211. The reversal of 109209209 is 902902901.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 902902901 = 59 ⋅15303439.

It is a cyclic number.

It is not a de Polignac number, because 109209209 - 2¹² = 109205113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (109209259) 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 in 3 ways as a sum of consecutive naturals, for example, 584 + ... + 14790.

It is an arithmetic number, because the mean of its divisors is an integer number (27307776).

Almost surely, 2^109209209 is an apocalyptic number.

It is an amenable number.

109209209 is a deficient number, since it is larger than the sum of its proper divisors (21895).

109209209 is an equidigital number, since it uses as much as digits as its factorization.

109209209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21894.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 109209209 is about 10450.3209998545. The cubic root of 109209209 is about 477.9910378623.

The spelling of 109209209 in words is "one hundred nine million, two hundred nine thousand, two hundred nine".