117217281 has 4 divisors (see below), whose sum is σ = 156289712. Its totient is φ = 78144852.

The previous prime is 117217279. The next prime is 117217283. The reversal of 117217281 is 182712711.

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.

It is an interprime number because it is at equal distance from previous prime (117217279) and next prime (117217283).

It is not a de Polignac number, because 117217281 - 2¹ = 117217279 is a prime.

It is a super-2 number, since 2×117217281² = 27479781930065922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117217283) 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, 19536211 + ... + 19536216.

It is an arithmetic number, because the mean of its divisors is an integer number (39072428).

Almost surely, 2^117217281 is an apocalyptic number.

It is an amenable number.

117217281 is a deficient number, since it is larger than the sum of its proper divisors (39072431).

117217281 is an equidigital number, since it uses as much as digits as its factorization.

117217281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39072430.

The product of its digits is 1568, while the sum is 30.

The square root of 117217281 is about 10826.6929853949. The cubic root of 117217281 is about 489.3999053855.

Adding to 117217281 its reverse (182712711), we get a palindrome (299929992).

The spelling of 117217281 in words is "one hundred seventeen million, two hundred seventeen thousand, two hundred eighty-one".