217131313 has 8 divisors (see below), whose sum is σ = 250560128. Its totient is φ = 184305024.

The previous prime is 217131311. The next prime is 217131319. The reversal of 217131313 is 313131712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 217131313 - 2¹ = 217131311 is a prime.

It is not an unprimeable number, because it can be changed into a prime (217131311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149856 + ... + 151297.

It is an arithmetic number, because the mean of its divisors is an integer number (31320016).

Almost surely, 2^217131313 is an apocalyptic number.

It is an amenable number.

217131313 is a deficient number, since it is larger than the sum of its proper divisors (33428815).

217131313 is a wasteful number, since it uses less digits than its factorization.

217131313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301263.

The product of its digits is 378, while the sum is 22.

The square root of 217131313 is about 14735.3762422274. The cubic root of 217131313 is about 601.0456885374.

The spelling of 217131313 in words is "two hundred seventeen million, one hundred thirty-one thousand, three hundred thirteen".