218638151 has 2 divisors, whose sum is σ = 218638152. Its totient is φ = 218638150.

The previous prime is 218638141. The next prime is 218638157. The reversal of 218638151 is 151836812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 218638151 - 2⁶ = 218638087 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218638157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109319075 + 109319076.

It is an arithmetic number, because the mean of its divisors is an integer number (109319076).

Almost surely, 2^218638151 is an apocalyptic number.

218638151 is a deficient number, since it is larger than the sum of its proper divisors (1).

218638151 is an equidigital number, since it uses as much as digits as its factorization.

218638151 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 35.

The square root of 218638151 is about 14786.4177879566. The cubic root of 218638151 is about 602.4328544400.

The spelling of 218638151 in words is "two hundred eighteen million, six hundred thirty-eight thousand, one hundred fifty-one".