218820969 has 12 divisors (see below), whose sum is σ = 321257092. Its totient is φ = 143488800.

The previous prime is 218820949. The next prime is 218820983. The reversal of 218820969 is 969028812.

218820969 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 115025625 + 103795344 = 10725^2 + 10188^2 .

It is not a de Polignac number, because 218820969 - 2⁷ = 218820841 is a prime.

It is a super-2 number, since 2×218820969² = 95765232948197922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218820949) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 198742 + ... + 199839.

Almost surely, 2^218820969 is an apocalyptic number.

It is an amenable number.

218820969 is a deficient number, since it is larger than the sum of its proper divisors (102436123).

218820969 is a wasteful number, since it uses less digits than its factorization.

218820969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398648 (or 398645 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 218820969 is about 14792.5984532806. The cubic root of 218820969 is about 602.6007191456.

The spelling of 218820969 in words is "two hundred eighteen million, eight hundred twenty thousand, nine hundred sixty-nine".