218641147 has 2 divisors, whose sum is σ = 218641148. Its totient is φ = 218641146.

The previous prime is 218641127. The next prime is 218641153. The reversal of 218641147 is 741146812.

It is a happy number.

218641147 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 218641147 - 2²⁷ = 84423419 is a prime.

It is a super-2 number, since 2×218641147² = 95607902322951218, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (218641117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109320573 + 109320574.

It is an arithmetic number, because the mean of its divisors is an integer number (109320574).

Almost surely, 2^218641147 is an apocalyptic number.

218641147 is a deficient number, since it is larger than the sum of its proper divisors (1).

218641147 is an equidigital number, since it uses as much as digits as its factorization.

218641147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10752, while the sum is 34.

The square root of 218641147 is about 14786.5190967989. The cubic root of 218641147 is about 602.4356061412.

Adding to 218641147 its reverse (741146812), we get a palindrome (959787959).

The spelling of 218641147 in words is "two hundred eighteen million, six hundred forty-one thousand, one hundred forty-seven".