217030523 has 2 divisors, whose sum is σ = 217030524. Its totient is φ = 217030522.

The previous prime is 217030511. The next prime is 217030543. The reversal of 217030523 is 325030712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 217030523 - 2¹² = 217026427 is a prime.

It is not a weakly prime, because it can be changed into another prime (217030543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108515261 + 108515262.

It is an arithmetic number, because the mean of its divisors is an integer number (108515262).

Almost surely, 2^217030523 is an apocalyptic number.

217030523 is a deficient number, since it is larger than the sum of its proper divisors (1).

217030523 is an equidigital number, since it uses as much as digits as its factorization.

217030523 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 217030523 is about 14731.9558443541. The cubic root of 217030523 is about 600.9526745145.

The spelling of 217030523 in words is "two hundred seventeen million, thirty thousand, five hundred twenty-three".