216170851 has 4 divisors (see below), whose sum is σ = 232799392. Its totient is φ = 199542312.

The previous prime is 216170837. The next prime is 216170873. The reversal of 216170851 is 158071612.

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 216170851 - 2⁷ = 216170723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216170831) 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, 8314251 + ... + 8314276.

It is an arithmetic number, because the mean of its divisors is an integer number (58199848).

Almost surely, 2^216170851 is an apocalyptic number.

216170851 is a deficient number, since it is larger than the sum of its proper divisors (16628541).

216170851 is a wasteful number, since it uses less digits than its factorization.

216170851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16628540.

The product of its (nonzero) digits is 3360, while the sum is 31.

The square root of 216170851 is about 14702.7497768275. The cubic root of 216170851 is about 600.1581536791.

The spelling of 216170851 in words is "two hundred sixteen million, one hundred seventy thousand, eight hundred fifty-one".