218151697 has 2 divisors, whose sum is σ = 218151698. Its totient is φ = 218151696.

The previous prime is 218151679. The next prime is 218151709. The reversal of 218151697 is 796151812.

It is a happy number.

Together with previous prime (218151679) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 217149696 + 1002001 = 14736^2 + 1001^2 .

It is a cyclic number.

It is not a de Polignac number, because 218151697 - 2¹¹ = 218149649 is a prime.

It is not a weakly prime, because it can be changed into another prime (218154697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109075848 + 109075849.

It is an arithmetic number, because the mean of its divisors is an integer number (109075849).

Almost surely, 2^218151697 is an apocalyptic number.

It is an amenable number.

218151697 is a deficient number, since it is larger than the sum of its proper divisors (1).

218151697 is an equidigital number, since it uses as much as digits as its factorization.

218151697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 40.

The square root of 218151697 is about 14769.9592755024. The cubic root of 218151697 is about 601.9857328951.

The spelling of 218151697 in words is "two hundred eighteen million, one hundred fifty-one thousand, six hundred ninety-seven".