217674649 has 2 divisors, whose sum is σ = 217674650. Its totient is φ = 217674648.

The previous prime is 217674641. The next prime is 217674661. The reversal of 217674649 is 946476712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140849424 + 76825225 = 11868^2 + 8765^2 .

It is a cyclic number.

It is not a de Polignac number, because 217674649 - 2³ = 217674641 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 217674599 and 217674608.

It is not a weakly prime, because it can be changed into another prime (217674641) 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, 108837324 + 108837325.

It is an arithmetic number, because the mean of its divisors is an integer number (108837325).

Almost surely, 2^217674649 is an apocalyptic number.

It is an amenable number.

217674649 is a deficient number, since it is larger than the sum of its proper divisors (1).

217674649 is an equidigital number, since it uses as much as digits as its factorization.

217674649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 46.

The square root of 217674649 is about 14753.8011712236. The cubic root of 217674649 is about 601.5466108254.

The spelling of 217674649 in words is "two hundred seventeen million, six hundred seventy-four thousand, six hundred forty-nine".