216791271 has 6 divisors (see below), whose sum is σ = 313142960. Its totient is φ = 144527508.

The previous prime is 216791257. The next prime is 216791279. The reversal of 216791271 is 172197612.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-216791271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216791279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12043951 + ... + 12043968.

Almost surely, 2^216791271 is an apocalyptic number.

216791271 is a deficient number, since it is larger than the sum of its proper divisors (96351689).

216791271 is a wasteful number, since it uses less digits than its factorization.

216791271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24087925 (or 24087922 counting only the distinct ones).

The product of its digits is 10584, while the sum is 36.

The square root of 216791271 is about 14723.8334342657. The cubic root of 216791271 is about 600.7317655026.

The spelling of 216791271 in words is "two hundred sixteen million, seven hundred ninety-one thousand, two hundred seventy-one".