117198721 has 12 divisors (see below), whose sum is σ = 122577840. Its totient is φ = 112021200.

The previous prime is 117198713. The next prime is 117198733. The reversal of 117198721 is 127891711.

It is not a de Polignac number, because 117198721 - 2³ = 117198713 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117198701) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 80046 + ... + 81496.

It is an arithmetic number, because the mean of its divisors is an integer number (10214820).

Almost surely, 2^117198721 is an apocalyptic number.

It is an amenable number.

117198721 is a deficient number, since it is larger than the sum of its proper divisors (5379119).

117198721 is an equidigital number, since it uses as much as digits as its factorization.

117198721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1584 (or 1547 counting only the distinct ones).

The product of its digits is 7056, while the sum is 37.

The square root of 117198721 is about 10825.8358106892. The cubic root of 117198721 is about 489.3740737515.

The spelling of 117198721 in words is "one hundred seventeen million, one hundred ninety-eight thousand, seven hundred twenty-one".