1217947433887 has 2 divisors, whose sum is σ = 1217947433888. Its totient is φ = 1217947433886.

The previous prime is 1217947433851. The next prime is 1217947433897. The reversal of 1217947433887 is 7883347497121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1217947433887 - 2¹⁵ = 1217947401119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1217947433837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608973716943 + 608973716944.

It is an arithmetic number, because the mean of its divisors is an integer number (608973716944).

Almost surely, 2^{1217947433887} is an apocalyptic number.

1217947433887 is a deficient number, since it is larger than the sum of its proper divisors (1).

1217947433887 is an equidigital number, since it uses as much as digits as its factorization.

1217947433887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56899584, while the sum is 64.

The spelling of 1217947433887 in words is "one trillion, two hundred seventeen billion, nine hundred forty-seven million, four hundred thirty-three thousand, eight hundred eighty-seven".