216171093 has 8 divisors (see below), whose sum is σ = 291701088. Its totient is φ = 142377584.

The previous prime is 216171083. The next prime is 216171101. The reversal of 216171093 is 390171612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 216171093 - 2⁵ = 216171061 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 216171093.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216171013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 433830 + ... + 434327.

It is an arithmetic number, because the mean of its divisors is an integer number (36462636).

Almost surely, 2^216171093 is an apocalyptic number.

It is an amenable number.

216171093 is a deficient number, since it is larger than the sum of its proper divisors (75529995).

216171093 is an equidigital number, since it uses as much as digits as its factorization.

216171093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868243.

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 216171093 is about 14702.7580065782. The cubic root of 216171093 is about 600.1583776350.

The spelling of 216171093 in words is "two hundred sixteen million, one hundred seventy-one thousand, ninety-three".