109132721 has 8 divisors (see below), whose sum is σ = 113922024. Its totient is φ = 104440320.

The previous prime is 109132717. The next prime is 109132729. The reversal of 109132721 is 127231901.

It can be written as a sum of positive squares in 4 ways, for example, as 160000 + 108972721 = 400^2 + 10439^2 .

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 109132721 - 2² = 109132717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (109132729) 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, 21920 + ... + 26433.

It is an arithmetic number, because the mean of its divisors is an integer number (14240253).

Almost surely, 2^109132721 is an apocalyptic number.

It is an amenable number.

109132721 is a deficient number, since it is larger than the sum of its proper divisors (4789303).

109132721 is an equidigital number, since it uses as much as digits as its factorization.

109132721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48451.

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 109132721 is about 10446.6607583476. The cubic root of 109132721 is about 477.8794199332.

The spelling of 109132721 in words is "one hundred nine million, one hundred thirty-two thousand, seven hundred twenty-one".