216869245 has 8 divisors (see below), whose sum is σ = 260825400. Its totient is φ = 173107200.

The previous prime is 216869243. The next prime is 216869251. The reversal of 216869245 is 542968612.

It can be written as a sum of positive squares in 4 ways, for example, as 26925721 + 189943524 = 5189^2 + 13782^2 .

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

It is not a de Polignac number, because 216869245 - 2¹ = 216869243 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216869243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46056 + ... + 50545.

It is an arithmetic number, because the mean of its divisors is an integer number (32603175).

Almost surely, 2^216869245 is an apocalyptic number.

It is an amenable number.

216869245 is a deficient number, since it is larger than the sum of its proper divisors (43956155).

216869245 is an equidigital number, since it uses as much as digits as its factorization.

216869245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97055.

The product of its digits is 207360, while the sum is 43.

The square root of 216869245 is about 14726.4810800137. The cubic root of 216869245 is about 600.8037792322.

The spelling of 216869245 in words is "two hundred sixteen million, eight hundred sixty-nine thousand, two hundred forty-five".