218890069 has 2 divisors, whose sum is σ = 218890070. Its totient is φ = 218890068.

The previous prime is 218890033. The next prime is 218890093. The reversal of 218890069 is 960098812.

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., 212051844 + 6838225 = 14562^2 + 2615^2 .

It is a cyclic number.

It is not a de Polignac number, because 218890069 - 2¹³ = 218881877 is a prime.

It is a super-2 number, since 2×218890069² = 95825724613649522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218890019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109445034 + 109445035.

It is an arithmetic number, because the mean of its divisors is an integer number (109445035).

Almost surely, 2^218890069 is an apocalyptic number.

It is an amenable number.

218890069 is a deficient number, since it is larger than the sum of its proper divisors (1).

218890069 is an equidigital number, since it uses as much as digits as its factorization.

218890069 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 43.

The square root of 218890069 is about 14794.9338964390. The cubic root of 218890069 is about 602.6641428775.

The spelling of 218890069 in words is "two hundred eighteen million, eight hundred ninety thousand, sixty-nine".