117216305 has 4 divisors (see below), whose sum is σ = 140659572. Its totient is φ = 93773040.

The previous prime is 117216287. The next prime is 117216331. The reversal of 117216305 is 503612711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 503612711 = 7 ⋅71944673.

It can be written as a sum of positive squares in 2 ways, for example, as 71098624 + 46117681 = 8432^2 + 6791^2 .

It is not a de Polignac number, because 117216305 - 2²⁴ = 100439089 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11721626 + ... + 11721635.

It is an arithmetic number, because the mean of its divisors is an integer number (35164893).

Almost surely, 2^117216305 is an apocalyptic number.

It is an amenable number.

117216305 is a deficient number, since it is larger than the sum of its proper divisors (23443267).

117216305 is an equidigital number, since it uses as much as digits as its factorization.

117216305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23443266.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 117216305 is about 10826.6479115191. The cubic root of 117216305 is about 489.3985470658.

The spelling of 117216305 in words is "one hundred seventeen million, two hundred sixteen thousand, three hundred five".