217471243 has 12 divisors (see below), whose sum is σ = 243555984. Its totient is φ = 193965200.

The previous prime is 217471211. The next prime is 217471271. The reversal of 217471243 is 342174712.

It is not a de Polignac number, because 217471243 - 2⁵ = 217471211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (217471273) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10543 + ... + 23368.

It is an arithmetic number, because the mean of its divisors is an integer number (20296332).

Almost surely, 2^217471243 is an apocalyptic number.

217471243 is a deficient number, since it is larger than the sum of its proper divisors (26084741).

217471243 is a wasteful number, since it uses less digits than its factorization.

217471243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33986 (or 33975 counting only the distinct ones).

The product of its digits is 9408, while the sum is 31.

The square root of 217471243 is about 14746.9062179157. The cubic root of 217471243 is about 601.3591807582.

The spelling of 217471243 in words is "two hundred seventeen million, four hundred seventy-one thousand, two hundred forty-three".