1217375081543 has 2 divisors, whose sum is σ = 1217375081544. Its totient is φ = 1217375081542.

The previous prime is 1217375081497. The next prime is 1217375081569. The reversal of 1217375081543 is 3451805737121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1217375081543 - 2³⁰ = 1216301339719 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1217375081743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608687540771 + 608687540772.

It is an arithmetic number, because the mean of its divisors is an integer number (608687540772).

Almost surely, 2^{1217375081543} is an apocalyptic number.

1217375081543 is a deficient number, since it is larger than the sum of its proper divisors (1).

1217375081543 is an equidigital number, since it uses as much as digits as its factorization.

1217375081543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 705600, while the sum is 47.

The spelling of 1217375081543 in words is "one trillion, two hundred seventeen billion, three hundred seventy-five million, eighty-one thousand, five hundred forty-three".