1217518345097 has 2 divisors, whose sum is σ = 1217518345098. Its totient is φ = 1217518345096.

The previous prime is 1217518345049. The next prime is 1217518345151. The reversal of 1217518345097 is 7905438157121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1174147783561 + 43370561536 = 1083581^2 + 208256^2 .

It is a cyclic number.

It is not a de Polignac number, because 1217518345097 - 2⁸ = 1217518344841 is a prime.

It is not a weakly prime, because it can be changed into another prime (1217518345007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608759172548 + 608759172549.

It is an arithmetic number, because the mean of its divisors is an integer number (608759172549).

Almost surely, 2^{1217518345097} is an apocalyptic number.

It is an amenable number.

1217518345097 is a deficient number, since it is larger than the sum of its proper divisors (1).

1217518345097 is an equidigital number, since it uses as much as digits as its factorization.

1217518345097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2116800, while the sum is 53.

The spelling of 1217518345097 in words is "one trillion, two hundred seventeen billion, five hundred eighteen million, three hundred forty-five thousand, ninety-seven".