109209897 has 8 divisors (see below), whose sum is σ = 161792480. Its totient is φ = 72806580.

The previous prime is 109209889. The next prime is 109209899. The reversal of 109209897 is 798902901.

It is not a de Polignac number, because 109209897 - 2³ = 109209889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (109209899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2022379 + ... + 2022432.

It is an arithmetic number, because the mean of its divisors is an integer number (20224060).

Almost surely, 2^109209897 is an apocalyptic number.

It is an amenable number.

109209897 is a deficient number, since it is larger than the sum of its proper divisors (52582583).

109209897 is an equidigital number, since it uses as much as digits as its factorization.

109209897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4044820 (or 4044814 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 45.

The square root of 109209897 is about 10450.3539174518. The cubic root of 109209897 is about 477.9920416151.

The spelling of 109209897 in words is "one hundred nine million, two hundred nine thousand, eight hundred ninety-seven".