218460481 has 2 divisors, whose sum is σ = 218460482. Its totient is φ = 218460480.

The previous prime is 218460479. The next prime is 218460491. The reversal of 218460481 is 184064812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 190992400 + 27468081 = 13820^2 + 5241^2 .

It is a cyclic number.

It is not a de Polignac number, because 218460481 - 2¹ = 218460479 is a prime.

It is a super-2 number, since 2×218460481² = 95449963517502722, which contains 22 as substring.

Together with 218460479, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (218460491) 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, 109230240 + 109230241.

It is an arithmetic number, because the mean of its divisors is an integer number (109230241).

Almost surely, 2^218460481 is an apocalyptic number.

It is an amenable number.

218460481 is a deficient number, since it is larger than the sum of its proper divisors (1).

218460481 is an equidigital number, since it uses as much as digits as its factorization.

218460481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12288, while the sum is 34.

The square root of 218460481 is about 14780.4086885309. The cubic root of 218460481 is about 602.2696269785.

The spelling of 218460481 in words is "two hundred eighteen million, four hundred sixty thousand, four hundred eighty-one".