117709281 has 10 divisors (see below), whose sum is σ = 175837442. Its totient is φ = 78472800.

The previous prime is 117709271. The next prime is 117709283. The reversal of 117709281 is 182907711.

It can be written as a sum of positive squares in only one way, i.e., 112021056 + 5688225 = 10584^2 + 2385^2 .

It is not a de Polignac number, because 117709281 - 2⁷ = 117709153 is a prime.

It is a super-2 number, since 2×117709281² = 27710949667073922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (117709283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 726520 + ... + 726681.

Almost surely, 2^117709281 is an apocalyptic number.

It is an amenable number.

117709281 is a deficient number, since it is larger than the sum of its proper divisors (58128161).

117709281 is an equidigital number, since it uses as much as digits as its factorization.

117709281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1453213 (or 1453204 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 36.

The square root of 117709281 is about 10849.3908123913. The cubic root of 117709281 is about 490.0836744514.

The spelling of 117709281 in words is "one hundred seventeen million, seven hundred nine thousand, two hundred eighty-one".