217308107 has 4 divisors (see below), whose sum is σ = 224801520. Its totient is φ = 209814696.

The previous prime is 217308101. The next prime is 217308137. The reversal of 217308107 is 701803712.

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

It is a cyclic number.

It is not a de Polignac number, because 217308107 - 2⁶ = 217308043 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 7493383 = 217308107 / (2 + 1 + 7 + 3 + 0 + 8 + 1 + 0 + 7).

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 217308107.

It is not an unprimeable number, because it can be changed into a prime (217308101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3746663 + ... + 3746720.

It is an arithmetic number, because the mean of its divisors is an integer number (56200380).

Almost surely, 2^217308107 is an apocalyptic number.

217308107 is a deficient number, since it is larger than the sum of its proper divisors (7493413).

217308107 is an equidigital number, since it uses as much as digits as its factorization.

217308107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7493412.

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 217308107 is about 14741.3739861656. The cubic root of 217308107 is about 601.2087733282.

The spelling of 217308107 in words is "two hundred seventeen million, three hundred eight thousand, one hundred seven".