975981217 has 2 divisors, whose sum is σ = 975981218. Its totient is φ = 975981216.

The previous prime is 975981199. The next prime is 975981239. The reversal of 975981217 is 712189579.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 717382656 + 258598561 = 26784^2 + 16081^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-975981217 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (975981257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 487990608 + 487990609.

It is an arithmetic number, because the mean of its divisors is an integer number (487990609).

Almost surely, 2^975981217 is an apocalyptic number.

It is an amenable number.

975981217 is a deficient number, since it is larger than the sum of its proper divisors (1).

975981217 is an equidigital number, since it uses as much as digits as its factorization.

975981217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 317520, while the sum is 49.

The square root of 975981217 is about 31240.6980875908. The cubic root of 975981217 is about 991.9287695044.

The spelling of 975981217 in words is "nine hundred seventy-five million, nine hundred eighty-one thousand, two hundred seventeen".