109116721 has 8 divisors (see below), whose sum is σ = 124824320. Its totient is φ = 93439008.

The previous prime is 109116713. The next prime is 109116731. The reversal of 109116721 is 127611901.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 109116721 - 2³ = 109116713 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 109116721.

It is not an unprimeable number, because it can be changed into a prime (109116731) 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 7 ways as a sum of consecutive naturals, for example, 1000 + ... + 14806.

It is an arithmetic number, because the mean of its divisors is an integer number (15603040).

Almost surely, 2^109116721 is an apocalyptic number.

It is an amenable number.

109116721 is a deficient number, since it is larger than the sum of its proper divisors (15707599).

109116721 is a wasteful number, since it uses less digits than its factorization.

109116721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14943.

The product of its (nonzero) digits is 756, while the sum is 28.

The square root of 109116721 is about 10445.8949353323. The cubic root of 109116721 is about 477.8560647489.

The spelling of 109116721 in words is "one hundred nine million, one hundred sixteen thousand, seven hundred twenty-one".