216226985 has 8 divisors (see below), whose sum is σ = 279431880. Its totient is φ = 159675264.

The previous prime is 216226957. The next prime is 216226993. The reversal of 216226985 is 589622612.

It can be written as a sum of positive squares in 4 ways, for example, as 107584 + 216119401 = 328^2 + 14701^2 .

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 216226985 - 2⁶ = 216226921 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1663220 + ... + 1663349.

It is an arithmetic number, because the mean of its divisors is an integer number (34928985).

Almost surely, 2^216226985 is an apocalyptic number.

It is an amenable number.

216226985 is a deficient number, since it is larger than the sum of its proper divisors (63204895).

216226985 is a wasteful number, since it uses less digits than its factorization.

216226985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3326587.

The product of its digits is 103680, while the sum is 41.

The square root of 216226985 is about 14704.6586155545. The cubic root of 216226985 is about 600.2100977193.

The spelling of 216226985 in words is "two hundred sixteen million, two hundred twenty-six thousand, nine hundred eighty-five".