117784721 has 4 divisors (see below), whose sum is σ = 124713252. Its totient is φ = 110856192.

The previous prime is 117784703. The next prime is 117784729. The reversal of 117784721 is 127487711.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 110145025 + 7639696 = 10495^2 + 2764^2 .

It is a cyclic number.

It is not a de Polignac number, because 117784721 - 2⁶ = 117784657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117784729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3464240 + ... + 3464273.

It is an arithmetic number, because the mean of its divisors is an integer number (31178313).

Almost surely, 2^117784721 is an apocalyptic number.

It is an amenable number.

117784721 is a deficient number, since it is larger than the sum of its proper divisors (6928531).

117784721 is an equidigital number, since it uses as much as digits as its factorization.

117784721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6928530.

The product of its digits is 21952, while the sum is 38.

The square root of 117784721 is about 10852.8669484151. The cubic root of 117784721 is about 490.1883504703.

The spelling of 117784721 in words is "one hundred seventeen million, seven hundred eighty-four thousand, seven hundred twenty-one".