217530023 has 2 divisors, whose sum is σ = 217530024. Its totient is φ = 217530022.

The previous prime is 217529941. The next prime is 217530041. The reversal of 217530023 is 320035712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 217530023 - 2¹⁸ = 217267879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217530823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108765011 + 108765012.

It is an arithmetic number, because the mean of its divisors is an integer number (108765012).

Almost surely, 2^217530023 is an apocalyptic number.

217530023 is a deficient number, since it is larger than the sum of its proper divisors (1).

217530023 is an equidigital number, since it uses as much as digits as its factorization.

217530023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 217530023 is about 14748.8990436575. The cubic root of 217530023 is about 601.4133560566.

Adding to 217530023 its reverse (320035712), we get a palindrome (537565735).

The spelling of 217530023 in words is "two hundred seventeen million, five hundred thirty thousand, twenty-three".