218209469 has 2 divisors, whose sum is σ = 218209470. Its totient is φ = 218209468.

The previous prime is 218209463. The next prime is 218209493. The reversal of 218209469 is 964902812.

218209469 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 212780569 + 5428900 = 14587^2 + 2330^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218209469 is a prime.

It is a super-2 number, since 2×218209469² = 95230744722523922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218209463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109104734 + 109104735.

It is an arithmetic number, because the mean of its divisors is an integer number (109104735).

Almost surely, 2^218209469 is an apocalyptic number.

It is an amenable number.

218209469 is a deficient number, since it is larger than the sum of its proper divisors (1).

218209469 is an equidigital number, since it uses as much as digits as its factorization.

218209469 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 218209469 is about 14771.9148724869. The cubic root of 218209469 is about 602.0388684741.

The spelling of 218209469 in words is "two hundred eighteen million, two hundred nine thousand, four hundred sixty-nine".