117789681 has 4 divisors (see below), whose sum is σ = 157052912. Its totient is φ = 78526452.

The previous prime is 117789673. The next prime is 117789703. The reversal of 117789681 is 186987711.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 186987711 = 3 ⋅62329237.

It is not a de Polignac number, because 117789681 - 2³ = 117789673 is a prime.

It is a super-4 number, since 4×117789681⁴ (a number of 33 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

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 117789681.

It is not an unprimeable number, because it can be changed into a prime (117789641) 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, 19631611 + ... + 19631616.

It is an arithmetic number, because the mean of its divisors is an integer number (39263228).

Almost surely, 2^117789681 is an apocalyptic number.

It is an amenable number.

117789681 is a deficient number, since it is larger than the sum of its proper divisors (39263231).

117789681 is an equidigital number, since it uses as much as digits as its factorization.

117789681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39263230.

The product of its digits is 169344, while the sum is 48.

The square root of 117789681 is about 10853.0954570574. The cubic root of 117789681 is about 490.1952311027.

The spelling of 117789681 in words is "one hundred seventeen million, seven hundred eighty-nine thousand, six hundred eighty-one".