228517 has 2 divisors, whose sum is σ = 228518. Its totient is φ = 228516.

The previous prime is 228511. The next prime is 228521. The reversal of 228517 is 715822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171396 + 57121 = 414^2 + 239^2 .

It is a cyclic number.

It is not a de Polignac number, because 228517 - 2³ = 228509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 228491 and 228500.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114258 + 114259.

It is an arithmetic number, because the mean of its divisors is an integer number (114259).

2²²⁸⁵¹⁷ is an apocalyptic number.

It is an amenable number.

228517 is a deficient number, since it is larger than the sum of its proper divisors (1).

228517 is an equidigital number, since it uses as much as digits as its factorization.

228517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1120, while the sum is 25.

The square root of 228517 is about 478.0345175822. The cubic root of 228517 is about 61.1372882038.

The spelling of 228517 in words is "two hundred twenty-eight thousand, five hundred seventeen".