216973171 has 4 divisors (see below), whose sum is σ = 217680232. Its totient is φ = 216266112.

The previous prime is 216973153. The next prime is 216973177. The reversal of 216973171 is 171379612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216973171 - 2⁵ = 216973139 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216973171.

It is not an unprimeable number, because it can be changed into a prime (216973177) 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, 353070 + ... + 353683.

It is an arithmetic number, because the mean of its divisors is an integer number (54420058).

Almost surely, 2^216973171 is an apocalyptic number.

216973171 is a deficient number, since it is larger than the sum of its proper divisors (707061).

216973171 is an equidigital number, since it uses as much as digits as its factorization.

216973171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707060.

The product of its digits is 15876, while the sum is 37.

The square root of 216973171 is about 14730.0091989109. The cubic root of 216973171 is about 600.8997343816.

The spelling of 216973171 in words is "two hundred sixteen million, nine hundred seventy-three thousand, one hundred seventy-one".