216969255 has 48 divisors (see below), whose sum is σ = 388177920. Its totient is φ = 112056000.

The previous prime is 216969241. The next prime is 216969257. The reversal of 216969255 is 552969612.

It is a happy number.

It is not a de Polignac number, because 216969255 - 2⁵ = 216969223 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 216969255.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216969257) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 187930 + ... + 189080.

It is an arithmetic number, because the mean of its divisors is an integer number (8087040).

Almost surely, 2^216969255 is an apocalyptic number.

216969255 is a deficient number, since it is larger than the sum of its proper divisors (171208665).

216969255 is a wasteful number, since it uses less digits than its factorization.

216969255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1292 (or 1289 counting only the distinct ones).

The product of its digits is 291600, while the sum is 45.

The square root of 216969255 is about 14729.8762723928. The cubic root of 216969255 is about 600.8961192841.

The spelling of 216969255 in words is "two hundred sixteen million, nine hundred sixty-nine thousand, two hundred fifty-five".