217552013 has 6 divisors (see below), whose sum is σ = 253070766. Its totient is φ = 186473112.

The previous prime is 217552003. The next prime is 217552019. The reversal of 217552013 is 310255712.

It can be written as a sum of positive squares in only one way, i.e., 155426089 + 62125924 = 12467^2 + 7882^2 .

It is not a de Polignac number, because 217552013 - 2⁶ = 217551949 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217552019) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2219870 + ... + 2219967.

It is an arithmetic number, because the mean of its divisors is an integer number (42178461).

Almost surely, 2^217552013 is an apocalyptic number.

It is an amenable number.

217552013 is a deficient number, since it is larger than the sum of its proper divisors (35518753).

217552013 is an equidigital number, since it uses as much as digits as its factorization.

217552013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4439851 (or 4439844 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 217552013 is about 14749.6445041906. The cubic root of 217552013 is about 601.4336208977.

The spelling of 217552013 in words is "two hundred seventeen million, five hundred fifty-two thousand, thirteen".