218247157 has 2 divisors, whose sum is σ = 218247158. Its totient is φ = 218247156.

The previous prime is 218247143. The next prime is 218247181. The reversal of 218247157 is 751742812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 184036356 + 34210801 = 13566^2 + 5849^2 .

It is a cyclic number.

It is not a de Polignac number, because 218247157 - 2¹¹ = 218245109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218247137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109123578 + 109123579.

It is an arithmetic number, because the mean of its divisors is an integer number (109123579).

Almost surely, 2^218247157 is an apocalyptic number.

It is an amenable number.

218247157 is a deficient number, since it is larger than the sum of its proper divisors (1).

218247157 is an equidigital number, since it uses as much as digits as its factorization.

218247157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31360, while the sum is 37.

The square root of 218247157 is about 14773.1904814092. The cubic root of 218247157 is about 602.0735268154.

Adding to 218247157 its reverse (751742812), we get a palindrome (969989969).

The spelling of 218247157 in words is "two hundred eighteen million, two hundred forty-seven thousand, one hundred fifty-seven".