218487361 has 4 divisors (see below), whose sum is σ = 219073492. Its totient is φ = 217901232.

The previous prime is 218487337. The next prime is 218487389. The reversal of 218487361 is 163784812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 149597361 + 68890000 = 12231^2 + 8300^2 .

It is a cyclic number.

It is not a de Polignac number, because 218487361 - 2⁷ = 218487233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218482361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 292506 + ... + 293251.

It is an arithmetic number, because the mean of its divisors is an integer number (54768373).

Almost surely, 2^218487361 is an apocalyptic number.

It is an amenable number.

218487361 is a deficient number, since it is larger than the sum of its proper divisors (586131).

218487361 is an equidigital number, since it uses as much as digits as its factorization.

218487361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 586130.

The product of its digits is 64512, while the sum is 40.

The square root of 218487361 is about 14781.3179723596. The cubic root of 218487361 is about 602.2943276224.

The spelling of 218487361 in words is "two hundred eighteen million, four hundred eighty-seven thousand, three hundred sixty-one".