117640121 has 4 divisors (see below), whose sum is σ = 117678372. Its totient is φ = 117601872.

The previous prime is 117640109. The next prime is 117640129. The reversal of 117640121 is 121046711.

It is a happy number.

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 107329600 + 10310521 = 10360^2 + 3211^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-117640121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117640129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14066 + ... + 20811.

It is an arithmetic number, because the mean of its divisors is an integer number (29419593).

Almost surely, 2^117640121 is an apocalyptic number.

It is an amenable number.

117640121 is a deficient number, since it is larger than the sum of its proper divisors (38251).

117640121 is an equidigital number, since it uses as much as digits as its factorization.

117640121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38250.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 117640121 is about 10846.2030683553. The cubic root of 117640121 is about 489.9876728816.

Adding to 117640121 its reverse (121046711), we get a palindrome (238686832).

The spelling of 117640121 in words is "one hundred seventeen million, six hundred forty thousand, one hundred twenty-one".