117288889 has 4 divisors (see below), whose sum is σ = 117745524. Its totient is φ = 116832256.

The previous prime is 117288887. The next prime is 117288929. The reversal of 117288889 is 988882711.

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 54641664 + 62647225 = 7392^2 + 7915^2 .

It is a cyclic number.

It is not a de Polignac number, because 117288889 - 2¹ = 117288887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117288883) 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, 227932 + ... + 228445.

It is an arithmetic number, because the mean of its divisors is an integer number (29436381).

Almost surely, 2^117288889 is an apocalyptic number.

It is an amenable number.

117288889 is a deficient number, since it is larger than the sum of its proper divisors (456635).

117288889 is an equidigital number, since it uses as much as digits as its factorization.

117288889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456634.

The product of its digits is 516096, while the sum is 52.

The square root of 117288889 is about 10829.9994921514. Note that the first 3 decimals coincide. The cubic root of 117288889 is about 489.4995431813.

The spelling of 117288889 in words is "one hundred seventeen million, two hundred eighty-eight thousand, eight hundred eighty-nine".