217485532931 has 4 divisors (see below), whose sum is σ = 230278799592. Its totient is φ = 204692266272.

The previous prime is 217485532919. The next prime is 217485532933. The reversal of 217485532931 is 139235584712.

217485532931 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 217485532931 - 2¹⁸ = 217485270787 is a prime.

It is a super-3 number, since 3×217485532931³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 217485532931.

It is not an unprimeable number, because it can be changed into a prime (217485532933) 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, 6396633305 + ... + 6396633338.

It is an arithmetic number, because the mean of its divisors is an integer number (57569699898).

Almost surely, 2^217485532931 is an apocalyptic number.

217485532931 is a deficient number, since it is larger than the sum of its proper divisors (12793266661).

217485532931 is a wasteful number, since it uses less digits than its factorization.

217485532931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12793266660.

The product of its digits is 1814400, while the sum is 50.

The spelling of 217485532931 in words is "two hundred seventeen billion, four hundred eighty-five million, five hundred thirty-two thousand, nine hundred thirty-one".