217439134807 has 4 divisors (see below), whose sum is σ = 220684495096. Its totient is φ = 214193774520.

The previous prime is 217439134793. The next prime is 217439134811. The reversal of 217439134807 is 708431934712.

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 217439134807 - 2¹¹ = 217439132759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217439134817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1622680044 + ... + 1622680177.

It is an arithmetic number, because the mean of its divisors is an integer number (55171123774).

Almost surely, 2^217439134807 is an apocalyptic number.

217439134807 is a deficient number, since it is larger than the sum of its proper divisors (3245360289).

217439134807 is an equidigital number, since it uses as much as digits as its factorization.

217439134807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3245360288.

The product of its (nonzero) digits is 1016064, while the sum is 49.

The spelling of 217439134807 in words is "two hundred seventeen billion, four hundred thirty-nine million, one hundred thirty-four thousand, eight hundred seven".