117189151721 has 4 divisors (see below), whose sum is σ = 124082631252. Its totient is φ = 110295672192.

The previous prime is 117189151679. The next prime is 117189151787. The reversal of 117189151721 is 127151981711.

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 44674740496 + 72514411225 = 211364^2 + 269285^2 .

It is a cyclic number.

It is not a de Polignac number, because 117189151721 - 2¹⁴ = 117189135337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117189151621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3446739740 + ... + 3446739773.

It is an arithmetic number, because the mean of its divisors is an integer number (31020657813).

Almost surely, 2^117189151721 is an apocalyptic number.

It is an amenable number.

117189151721 is a deficient number, since it is larger than the sum of its proper divisors (6893479531).

117189151721 is an equidigital number, since it uses as much as digits as its factorization.

117189151721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6893479530.

The product of its digits is 35280, while the sum is 44.

The spelling of 117189151721 in words is "one hundred seventeen billion, one hundred eighty-nine million, one hundred fifty-one thousand, seven hundred twenty-one".