109971909 has 6 divisors (see below), whose sum is σ = 158848326. Its totient is φ = 73314600.

The previous prime is 109971899. The next prime is 109971937. The reversal of 109971909 is 909179901.

It can be written as a sum of positive squares in only one way, i.e., 98069409 + 11902500 = 9903^2 + 3450^2 .

It is not a de Polignac number, because 109971909 - 2¹¹ = 109969861 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109971949) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6109542 + ... + 6109559.

It is an arithmetic number, because the mean of its divisors is an integer number (26474721).

Almost surely, 2^109971909 is an apocalyptic number.

It is an amenable number.

109971909 is a deficient number, since it is larger than the sum of its proper divisors (48876417).

109971909 is a wasteful number, since it uses less digits than its factorization.

109971909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12219107 (or 12219104 counting only the distinct ones).

The product of its (nonzero) digits is 45927, while the sum is 45.

The square root of 109971909 is about 10486.7492103130. The cubic root of 109971909 is about 479.1011956353.

The spelling of 109971909 in words is "one hundred nine million, nine hundred seventy-one thousand, nine hundred nine".