216659169 has 12 divisors (see below), whose sum is σ = 331361316. Its totient is φ = 135942912.

The previous prime is 216659167. The next prime is 216659171. The reversal of 216659169 is 961956612.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (216659167) and next prime (216659171).

It can be written as a sum of positive squares in 2 ways, for example, as 174240000 + 42419169 = 13200^2 + 6513^2 .

It is not a de Polignac number, because 216659169 - 2¹ = 216659167 is a prime.

It is a super-2 number, since 2×216659169² = 93882391023541122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (216659167) 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, 707884 + ... + 708189.

It is an arithmetic number, because the mean of its divisors is an integer number (27613443).

Almost surely, 2^216659169 is an apocalyptic number.

It is an amenable number.

216659169 is a deficient number, since it is larger than the sum of its proper divisors (114702147).

216659169 is a wasteful number, since it uses less digits than its factorization.

216659169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1416096 (or 1416093 counting only the distinct ones).

The product of its digits is 174960, while the sum is 45.

The square root of 216659169 is about 14719.3467586031. The cubic root of 216659169 is about 600.6097218556.

The spelling of 216659169 in words is "two hundred sixteen million, six hundred fifty-nine thousand, one hundred sixty-nine".