973509217 has 2 divisors, whose sum is σ = 973509218. Its totient is φ = 973509216.

The previous prime is 973509211. The next prime is 973509227. The reversal of 973509217 is 712905379.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 487923921 + 485585296 = 22089^2 + 22036^2 .

It is an emirp because it is prime and its reverse (712905379) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-973509217 is a prime.

It is not a weakly prime, because it can be changed into another prime (973509211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 486754608 + 486754609.

It is an arithmetic number, because the mean of its divisors is an integer number (486754609).

Almost surely, 2^973509217 is an apocalyptic number.

It is an amenable number.

973509217 is a deficient number, since it is larger than the sum of its proper divisors (1).

973509217 is an equidigital number, since it uses as much as digits as its factorization.

973509217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 119070, while the sum is 43.

The square root of 973509217 is about 31201.1092270772. The cubic root of 973509217 is about 991.0905972784.

The spelling of 973509217 in words is "nine hundred seventy-three million, five hundred nine thousand, two hundred seventeen".