218623147 has 2 divisors, whose sum is σ = 218623148. Its totient is φ = 218623146.

The previous prime is 218623117. The next prime is 218623187. The reversal of 218623147 is 741326812.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218623147 is a prime.

It is not a weakly prime, because it can be changed into another prime (218623117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109311573 + 109311574.

It is an arithmetic number, because the mean of its divisors is an integer number (109311574).

Almost surely, 2^218623147 is an apocalyptic number.

218623147 is a deficient number, since it is larger than the sum of its proper divisors (1).

218623147 is an equidigital number, since it uses as much as digits as its factorization.

218623147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 34.

The square root of 218623147 is about 14785.9104217495. The cubic root of 218623147 is about 602.4190735128.

Adding to 218623147 its reverse (741326812), we get a palindrome (959949959).

The spelling of 218623147 in words is "two hundred eighteen million, six hundred twenty-three thousand, one hundred forty-seven".