216725171 has 4 divisors (see below), whose sum is σ = 233396352. Its totient is φ = 200053992.

The previous prime is 216725137. The next prime is 216725177. The reversal of 216725171 is 171527612.

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 216725171 - 2⁶ = 216725107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216725177) 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, 8335571 + ... + 8335596.

It is an arithmetic number, because the mean of its divisors is an integer number (58349088).

Almost surely, 2^216725171 is an apocalyptic number.

216725171 is a deficient number, since it is larger than the sum of its proper divisors (16671181).

216725171 is a wasteful number, since it uses less digits than its factorization.

216725171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16671180.

The product of its digits is 5880, while the sum is 32.

The square root of 216725171 is about 14721.5886031366. The cubic root of 216725171 is about 600.6707046091.

The spelling of 216725171 in words is "two hundred sixteen million, seven hundred twenty-five thousand, one hundred seventy-one".