218147 has 6 divisors (see below), whose sum is σ = 226404. Its totient is φ = 210180.

The previous prime is 218143. The next prime is 218149. The reversal of 218147 is 741812.

It is not a de Polignac number, because 218147 - 2² = 218143 is a prime.

It is a super-2 number, since 2×218147² = 95176227218, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218143) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 848 + ... + 1074.

It is an arithmetic number, because the mean of its divisors is an integer number (37734).

2²¹⁸¹⁴⁷ is an apocalyptic number.

218147 is a deficient number, since it is larger than the sum of its proper divisors (8257).

218147 is an equidigital number, since it uses as much as digits as its factorization.

218147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289 (or 258 counting only the distinct ones).

The product of its digits is 448, while the sum is 23.

The square root of 218147 is about 467.0620943729. The cubic root of 218147 is about 60.1981412435.

Adding to 218147 its reverse (741812), we get a palindrome (959959).

The spelling of 218147 in words is "two hundred eighteen thousand, one hundred forty-seven".