218096729 has 2 divisors, whose sum is σ = 218096730. Its totient is φ = 218096728.

The previous prime is 218096717. The next prime is 218096737. The reversal of 218096729 is 927690812.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 126607504 + 91489225 = 11252^2 + 9565^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218096729 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 218096729.

It is not a weakly prime, because it can be changed into another prime (218096789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109048364 + 109048365.

It is an arithmetic number, because the mean of its divisors is an integer number (109048365).

Almost surely, 2^218096729 is an apocalyptic number.

It is an amenable number.

218096729 is a deficient number, since it is larger than the sum of its proper divisors (1).

218096729 is an equidigital number, since it uses as much as digits as its factorization.

218096729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 218096729 is about 14768.0983542229. The cubic root of 218096729 is about 601.9351675747.

The spelling of 218096729 in words is "two hundred eighteen million, ninety-six thousand, seven hundred twenty-nine".