217290713 has 4 divisors (see below), whose sum is σ = 217681380. Its totient is φ = 216900048.

The previous prime is 217290709. The next prime is 217290769. The reversal of 217290713 is 317092712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6692569 + 210598144 = 2587^2 + 14512^2 .

It is a cyclic number.

It is not a de Polignac number, because 217290713 - 2² = 217290709 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 217290713.

It is not an unprimeable number, because it can be changed into a prime (217290793) 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, 194498 + ... + 195611.

It is an arithmetic number, because the mean of its divisors is an integer number (54420345).

Almost surely, 2^217290713 is an apocalyptic number.

It is an amenable number.

217290713 is a deficient number, since it is larger than the sum of its proper divisors (390667).

217290713 is an equidigital number, since it uses as much as digits as its factorization.

217290713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390666.

The product of its (nonzero) digits is 5292, while the sum is 32.

The square root of 217290713 is about 14740.7840022164. The cubic root of 217290713 is about 601.1927320423.

The spelling of 217290713 in words is "two hundred seventeen million, two hundred ninety thousand, seven hundred thirteen".