108643509 has 18 divisors (see below), whose sum is σ = 169931970. Its totient is φ = 66856608.

The previous prime is 108643489. The next prime is 108643517. The reversal of 108643509 is 905346801.

108643509 is a `hidden beast` number, since 1 + 0 + 8 + 643 + 5 + 0 + 9 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 10692900 + 97950609 = 3270^2 + 9897^2 .

It is not a de Polignac number, because 108643509 - 2⁸ = 108643253 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 (108643519) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 34194 + ... + 37235.

It is an arithmetic number, because the mean of its divisors is an integer number (9440665).

Almost surely, 2^108643509 is an apocalyptic number.

It is an amenable number.

108643509 is a deficient number, since it is larger than the sum of its proper divisors (61288461).

108643509 is a wasteful number, since it uses less digits than its factorization.

108643509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71461 (or 71445 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 108643509 is about 10423.2197041030. The cubic root of 108643509 is about 477.1642829038.

The spelling of 108643509 in words is "one hundred eight million, six hundred forty-three thousand, five hundred nine".