217413296861 has 2 divisors, whose sum is σ = 217413296862. Its totient is φ = 217413296860.

The previous prime is 217413296857. The next prime is 217413296909. The reversal of 217413296861 is 168692314712.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 214085737636 + 3327559225 = 462694^2 + 57685^2 .

It is a cyclic number.

It is not a de Polignac number, because 217413296861 - 2² = 217413296857 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217413296831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108706648430 + 108706648431.

It is an arithmetic number, because the mean of its divisors is an integer number (108706648431).

Almost surely, 2^217413296861 is an apocalyptic number.

It is an amenable number.

217413296861 is a deficient number, since it is larger than the sum of its proper divisors (1).

217413296861 is an equidigital number, since it uses as much as digits as its factorization.

217413296861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 50.

The spelling of 217413296861 in words is "two hundred seventeen billion, four hundred thirteen million, two hundred ninety-six thousand, eight hundred sixty-one".