217157 has 2 divisors, whose sum is σ = 217158. Its totient is φ = 217156.

The previous prime is 217121. The next prime is 217163. The reversal of 217157 is 751712.

It is a happy number.

It is a Cunningham number, because it is equal to 466²+1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 217156 + 1 = 466^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 217157 - 2⁸ = 216901 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108578 + 108579.

It is an arithmetic number, because the mean of its divisors is an integer number (108579).

2²¹⁷¹⁵⁷ is an apocalyptic number.

It is an amenable number.

217157 is a deficient number, since it is larger than the sum of its proper divisors (1).

217157 is an equidigital number, since it uses as much as digits as its factorization.

217157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 490, while the sum is 23.

The square root of 217157 is about 466.0010729601. The cubic root of 217157 is about 60.1069389175.

Adding to 217157 its reverse (751712), we get a palindrome (968869).

The spelling of 217157 in words is "two hundred seventeen thousand, one hundred fifty-seven".