216109285 has 16 divisors (see below), whose sum is σ = 297340416. Its totient is φ = 147708288.

The previous prime is 216109261. The next prime is 216109301. The reversal of 216109285 is 582901612.

It is a de Polignac number, because none of the positive numbers 2^k-216109285 is a prime.

It is a super-2 number, since 2×216109285² = 93406446126422450, which contains 22 as substring.

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 216109285.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1092 + ... + 20818.

It is an arithmetic number, because the mean of its divisors is an integer number (18583776).

Almost surely, 2^216109285 is an apocalyptic number.

It is an amenable number.

216109285 is a deficient number, since it is larger than the sum of its proper divisors (81231131).

216109285 is a wasteful number, since it uses less digits than its factorization.

216109285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20052.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 216109285 is about 14700.6559377465. The cubic root of 216109285 is about 600.1011727540.

The spelling of 216109285 in words is "two hundred sixteen million, one hundred nine thousand, two hundred eighty-five".