216674281 has 2 divisors, whose sum is σ = 216674282. Its totient is φ = 216674280.

The previous prime is 216674261. The next prime is 216674351. The reversal of 216674281 is 182476612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140635881 + 76038400 = 11859^2 + 8720^2 .

It is a cyclic number.

It is not a de Polignac number, because 216674281 - 2¹¹ = 216672233 is a prime.

It is a super-2 number, since 2×216674281² = 93895488093733922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 216674281.

It is not a weakly prime, because it can be changed into another prime (216674201) 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 as a sum of consecutive naturals, namely, 108337140 + 108337141.

It is an arithmetic number, because the mean of its divisors is an integer number (108337141).

Almost surely, 2^216674281 is an apocalyptic number.

It is an amenable number.

216674281 is a deficient number, since it is larger than the sum of its proper divisors (1).

216674281 is an equidigital number, since it uses as much as digits as its factorization.

216674281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 37.

The square root of 216674281 is about 14719.8600876503. The cubic root of 216674281 is about 600.6236857281.

The spelling of 216674281 in words is "two hundred sixteen million, six hundred seventy-four thousand, two hundred eighty-one".