217734081 has 8 divisors (see below), whose sum is σ = 290543520. Its totient is φ = 145040352.

The previous prime is 217734047. The next prime is 217734089. The reversal of 217734081 is 180437712.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 217734081 - 2¹⁴ = 217717697 is a prime.

It is a super-2 number, since 2×217734081² = 94816260057829122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (217734089) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24436 + ... + 32133.

It is an arithmetic number, because the mean of its divisors is an integer number (36317940).

Almost surely, 2^217734081 is an apocalyptic number.

It is an amenable number.

217734081 is a deficient number, since it is larger than the sum of its proper divisors (72809439).

217734081 is a wasteful number, since it uses less digits than its factorization.

217734081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57855.

The product of its (nonzero) digits is 9408, while the sum is 33.

The square root of 217734081 is about 14755.8151587772. The cubic root of 217734081 is about 601.6013528683.

The spelling of 217734081 in words is "two hundred seventeen million, seven hundred thirty-four thousand, eighty-one".