1217306081 has 2 divisors, whose sum is σ = 1217306082. Its totient is φ = 1217306080.

The previous prime is 1217306071. The next prime is 1217306089. The reversal of 1217306081 is 1806037121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1202979856 + 14326225 = 34684^2 + 3785^2 .

It is a cyclic number.

It is not a de Polignac number, because 1217306081 - 2¹⁸ = 1217043937 is a prime.

It is a super-2 number, since 2×1217306081² = 2963668189679157122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1217306089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608653040 + 608653041.

It is an arithmetic number, because the mean of its divisors is an integer number (608653041).

Almost surely, 2^1217306081 is an apocalyptic number.

It is an amenable number.

1217306081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1217306081 is an equidigital number, since it uses as much as digits as its factorization.

1217306081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 1217306081 is about 34889.9137430863. The cubic root of 1217306081 is about 1067.7426662500.

The spelling of 1217306081 in words is "one billion, two hundred seventeen million, three hundred six thousand, eighty-one".