218145029 has 2 divisors, whose sum is σ = 218145030. Its totient is φ = 218145028.

The previous prime is 218145017. The next prime is 218145043. The reversal of 218145029 is 920541812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 216384100 + 1760929 = 14710^2 + 1327^2 .

It is a cyclic number.

It is not a de Polignac number, because 218145029 - 2²⁴ = 201367813 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 218144986 and 218145004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218145329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109072514 + 109072515.

It is an arithmetic number, because the mean of its divisors is an integer number (109072515).

Almost surely, 2^218145029 is an apocalyptic number.

It is an amenable number.

218145029 is a deficient number, since it is larger than the sum of its proper divisors (1).

218145029 is an equidigital number, since it uses as much as digits as its factorization.

218145029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 218145029 is about 14769.7335453284. The cubic root of 218145029 is about 601.9795994235.

The spelling of 218145029 in words is "two hundred eighteen million, one hundred forty-five thousand, twenty-nine".