218674109 has 2 divisors, whose sum is σ = 218674110. Its totient is φ = 218674108.

The previous prime is 218674063. The next prime is 218674121. The reversal of 218674109 is 901476812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 147744025 + 70930084 = 12155^2 + 8422^2 .

It is a cyclic number.

It is not a de Polignac number, because 218674109 - 2¹⁶ = 218608573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218674189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109337054 + 109337055.

It is an arithmetic number, because the mean of its divisors is an integer number (109337055).

Almost surely, 2^218674109 is an apocalyptic number.

It is an amenable number.

218674109 is a deficient number, since it is larger than the sum of its proper divisors (1).

218674109 is an equidigital number, since it uses as much as digits as its factorization.

218674109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 218674109 is about 14787.6336511289. The cubic root of 218674109 is about 602.4658787056.

The spelling of 218674109 in words is "two hundred eighteen million, six hundred seventy-four thousand, one hundred nine".