117821115 has 16 divisors (see below), whose sum is σ = 209460000. Its totient is φ = 62837856.

The previous prime is 117821089. The next prime is 117821117. The reversal of 117821115 is 511128711.

It is not a de Polignac number, because 117821115 - 2⁵ = 117821083 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (117821117) 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, 436240 + ... + 436509.

It is an arithmetic number, because the mean of its divisors is an integer number (13091250).

Almost surely, 2^117821115 is an apocalyptic number.

117821115 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

117821115 is a deficient number, since it is larger than the sum of its proper divisors (91638885).

117821115 is an equidigital number, since it uses as much as digits as its factorization.

117821115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872763 (or 872757 counting only the distinct ones).

The product of its digits is 560, while the sum is 27.

The square root of 117821115 is about 10854.5435187298. The cubic root of 117821115 is about 490.2388326198.

Adding to 117821115 its reverse (511128711), we get a palindrome (628949826).

The spelling of 117821115 in words is "one hundred seventeen million, eight hundred twenty-one thousand, one hundred fifteen".