1217240197 has 2 divisors, whose sum is σ = 1217240198. Its totient is φ = 1217240196.

The previous prime is 1217240191. The next prime is 1217240249. The reversal of 1217240197 is 7910427121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1216544641 + 695556 = 34879^2 + 834^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1217240197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1217240191) 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, 608620098 + 608620099.

It is an arithmetic number, because the mean of its divisors is an integer number (608620099).

Almost surely, 2^1217240197 is an apocalyptic number.

It is an amenable number.

1217240197 is a deficient number, since it is larger than the sum of its proper divisors (1).

1217240197 is an equidigital number, since it uses as much as digits as its factorization.

1217240197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 1217240197 is about 34888.9695605932. The cubic root of 1217240197 is about 1067.7234028321.

The spelling of 1217240197 in words is "one billion, two hundred seventeen million, two hundred forty thousand, one hundred ninety-seven".