217583461541 has 2 divisors, whose sum is σ = 217583461542. Its totient is φ = 217583461540.

The previous prime is 217583461427. The next prime is 217583461547. The reversal of 217583461541 is 145164385712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121403464900 + 96179996641 = 348430^2 + 310129^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-217583461541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217583461547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108791730770 + 108791730771.

It is an arithmetic number, because the mean of its divisors is an integer number (108791730771).

Almost surely, 2^217583461541 is an apocalyptic number.

It is an amenable number.

217583461541 is a deficient number, since it is larger than the sum of its proper divisors (1).

217583461541 is an equidigital number, since it uses as much as digits as its factorization.

217583461541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 806400, while the sum is 47.

The spelling of 217583461541 in words is "two hundred seventeen billion, five hundred eighty-three million, four hundred sixty-one thousand, five hundred forty-one".