117221515 has 4 divisors (see below), whose sum is σ = 140665824. Its totient is φ = 93777208.

The previous prime is 117221491. The next prime is 117221521. The reversal of 117221515 is 515122711.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-117221515 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 117221515.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11722147 + ... + 11722156.

It is an arithmetic number, because the mean of its divisors is an integer number (35166456).

Almost surely, 2^117221515 is an apocalyptic number.

117221515 is a deficient number, since it is larger than the sum of its proper divisors (23444309).

117221515 is an equidigital number, since it uses as much as digits as its factorization.

117221515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23444308.

The product of its digits is 700, while the sum is 25.

The square root of 117221515 is about 10826.8885188682. Note that the first 3 decimals coincide. The cubic root of 117221515 is about 489.4057978450.

The spelling of 117221515 in words is "one hundred seventeen million, two hundred twenty-one thousand, five hundred fifteen".