217911052 has 12 divisors (see below), whose sum is σ = 381521056. Its totient is φ = 108905040.

The previous prime is 217911047. The next prime is 217911053. The reversal of 217911052 is 250119712.

It is a self number, because there is not a number n which added to its sum of digits gives 217911052.

It is not an unprimeable number, because it can be changed into a prime (217911053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1899 + ... + 20962.

Almost surely, 2^217911052 is an apocalyptic number.

It is an amenable number.

217911052 is a deficient number, since it is larger than the sum of its proper divisors (163610004).

217911052 is a wasteful number, since it uses less digits than its factorization.

217911052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25248 (or 25246 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 28.

The square root of 217911052 is about 14761.8105935552. The cubic root of 217911052 is about 601.7642995859.

It can be divided in two parts, 2179 and 11052, that added together give a palindrome (13231).

The spelling of 217911052 in words is "two hundred seventeen million, nine hundred eleven thousand, fifty-two".