218680523 has 2 divisors, whose sum is σ = 218680524. Its totient is φ = 218680522.

The previous prime is 218680507. The next prime is 218680531. The reversal of 218680523 is 325086812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 218680523 - 2⁴ = 218680507 is a prime.

It is a super-2 number, since 2×218680523² = 95642342279107058, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (218680543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109340261 + 109340262.

It is an arithmetic number, because the mean of its divisors is an integer number (109340262).

Almost surely, 2^218680523 is an apocalyptic number.

218680523 is a deficient number, since it is larger than the sum of its proper divisors (1).

218680523 is an equidigital number, since it uses as much as digits as its factorization.

218680523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 218680523 is about 14787.8505199370. The cubic root of 218680523 is about 602.4717690209.

The spelling of 218680523 in words is "two hundred eighteen million, six hundred eighty thousand, five hundred twenty-three".