84721109 has 16 divisors (see below), whose sum is σ = 97044480. Its totient is φ = 73254000.

The previous prime is 84721097. The next prime is 84721111. The reversal of 84721109 is 90112748.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84721109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84721139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18014 + ... + 22224.

It is an arithmetic number, because the mean of its divisors is an integer number (6065280).

Almost surely, 2^84721109 is an apocalyptic number.

It is an amenable number.

84721109 is a deficient number, since it is larger than the sum of its proper divisors (12323371).

84721109 is a wasteful number, since it uses less digits than its factorization.

84721109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4312.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 84721109 is about 9204.4070422814. The cubic root of 84721109 is about 439.2015633740.

The spelling of 84721109 in words is "eighty-four million, seven hundred twenty-one thousand, one hundred nine".