1243829105689 has 2 divisors, whose sum is σ = 1243829105690. Its totient is φ = 1243829105688.

The previous prime is 1243829105641. The next prime is 1243829105699. The reversal of 1243829105689 is 9865019283421.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1213390371600 + 30438734089 = 1101540^2 + 174467^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243829105689 - 2¹⁷ = 1243828974617 is a prime.

It is a super-2 number, since 2×1243829105689² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1243829105699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621914552844 + 621914552845.

It is an arithmetic number, because the mean of its divisors is an integer number (621914552845).

Almost surely, 2^{1243829105689} is an apocalyptic number.

It is an amenable number.

1243829105689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243829105689 is an equidigital number, since it uses as much as digits as its factorization.

1243829105689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7464960, while the sum is 58.

The spelling of 1243829105689 in words is "one trillion, two hundred forty-three billion, eight hundred twenty-nine million, one hundred five thousand, six hundred eighty-nine".