117811643 has 4 divisors (see below), whose sum is σ = 118671720. Its totient is φ = 116951568.

The previous prime is 117811637. The next prime is 117811651. The reversal of 117811643 is 346118711.

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

It is a cyclic number.

It is not a de Polignac number, because 117811643 - 2¹⁰ = 117810619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117211643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 429833 + ... + 430106.

It is an arithmetic number, because the mean of its divisors is an integer number (29667930).

Almost surely, 2^117811643 is an apocalyptic number.

117811643 is a deficient number, since it is larger than the sum of its proper divisors (860077).

117811643 is an equidigital number, since it uses as much as digits as its factorization.

117811643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 860076.

The product of its digits is 4032, while the sum is 32.

The square root of 117811643 is about 10854.1071949746. The cubic root of 117811643 is about 490.2256950011.

It can be divided in two parts, 1178 and 11643, that added together give a palindrome (12821).

The spelling of 117811643 in words is "one hundred seventeen million, eight hundred eleven thousand, six hundred forty-three".