217751052 has 12 divisors (see below), whose sum is σ = 508085816. Its totient is φ = 72583680.

The previous prime is 217751033. The next prime is 217751057. The reversal of 217751052 is 250157712.

217751052 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (217751057) 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, 9072949 + ... + 9072972.

Almost surely, 2^217751052 is an apocalyptic number.

It is an amenable number.

217751052 is an abundant number, since it is smaller than the sum of its proper divisors (290334764).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

217751052 is a wasteful number, since it uses less digits than its factorization.

217751052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18145928 (or 18145926 counting only the distinct ones).

The product of its (nonzero) digits is 4900, while the sum is 30.

The square root of 217751052 is about 14756.3902089908. The cubic root of 217751052 is about 601.6169828075.

The spelling of 217751052 in words is "two hundred seventeen million, seven hundred fifty-one thousand, fifty-two".