217960049 has 2 divisors, whose sum is σ = 217960050. Its totient is φ = 217960048.

The previous prime is 217959979. The next prime is 217960073. The reversal of 217960049 is 940069712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 206784400 + 11175649 = 14380^2 + 3343^2 .

It is a cyclic number.

It is not a de Polignac number, because 217960049 - 2²⁴ = 201182833 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 217959994 and 217960021.

It is not a weakly prime, because it can be changed into another prime (217960079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108980024 + 108980025.

It is an arithmetic number, because the mean of its divisors is an integer number (108980025).

Almost surely, 2^217960049 is an apocalyptic number.

It is an amenable number.

217960049 is a deficient number, since it is larger than the sum of its proper divisors (1).

217960049 is an equidigital number, since it uses as much as digits as its factorization.

217960049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 217960049 is about 14763.4700866700. The cubic root of 217960049 is about 601.8093981640.

The spelling of 217960049 in words is "two hundred seventeen million, nine hundred sixty thousand, forty-nine".