1217947433851 has 2 divisors, whose sum is σ = 1217947433852. Its totient is φ = 1217947433850.

The previous prime is 1217947433837. The next prime is 1217947433887. The reversal of 1217947433851 is 1583347497121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1217947433851 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1217947433792 and 1217947433801.

It is not a weakly prime, because it can be changed into another prime (1217947433051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608973716925 + 608973716926.

It is an arithmetic number, because the mean of its divisors is an integer number (608973716926).

Almost surely, 2^{1217947433851} is an apocalyptic number.

1217947433851 is a deficient number, since it is larger than the sum of its proper divisors (1).

1217947433851 is an equidigital number, since it uses as much as digits as its factorization.

1217947433851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5080320, while the sum is 55.

The spelling of 1217947433851 in words is "one trillion, two hundred seventeen billion, nine hundred forty-seven million, four hundred thirty-three thousand, eight hundred fifty-one".