1228721884543 has 2 divisors, whose sum is σ = 1228721884544. Its totient is φ = 1228721884542.

The previous prime is 1228721884483. The next prime is 1228721884567. The reversal of 1228721884543 is 3454881278221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1228721884543 - 2¹⁷ = 1228721753471 is a prime.

It is a super-4 number, since 4×1228721884543⁴ (a number of 49 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1228721684543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614360942271 + 614360942272.

It is an arithmetic number, because the mean of its divisors is an integer number (614360942272).

Almost surely, 2^{1228721884543} is an apocalyptic number.

1228721884543 is a deficient number, since it is larger than the sum of its proper divisors (1).

1228721884543 is an equidigital number, since it uses as much as digits as its factorization.

1228721884543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6881280, while the sum is 55.

The spelling of 1228721884543 in words is "one trillion, two hundred twenty-eight billion, seven hundred twenty-one million, eight hundred eighty-four thousand, five hundred forty-three".