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218089 = 4672
BaseRepresentation
bin110101001111101001
3102002011101
4311033221
523434324
64401401
71565554
oct651751
9362141
10218089
11139943
12a6261
1378361
145969b
1544944
hex353e9

218089 has 3 divisors (see below), whose sum is σ = 218557. Its totient is φ = 217622.

The previous prime is 218087. The next prime is 218107. The reversal of 218089 is 980812.

218089 = T466 + T467.

The square root of 218089 is 467.

It is a perfect power (a square), and thus also a powerful number.

218089 is nontrivially palindromic in base 15.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 218089 - 21 = 218087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218081) 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 in 2 ways as a sum of consecutive naturals, for example, 234 + ... + 700.

2218089 is an apocalyptic number.

218089 is the 467-th square number.

218089 is the 234-th centered octagonal number.

It is an amenable number.

218089 is a deficient number, since it is larger than the sum of its proper divisors (468).

218089 is an frugal number, since it uses more digits than its factorization.

218089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934 (or 467 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 28.

The cubic root of 218089 is about 60.1928056950.

The spelling of 218089 in words is "two hundred eighteen thousand, eighty-nine".

Divisors: 1 467 218089