1243854135089 has 2 divisors, whose sum is σ = 1243854135090. Its totient is φ = 1243854135088.

The previous prime is 1243854135077. The next prime is 1243854135101. The reversal of 1243854135089 is 9805314583421.

It is a balanced prime because it is at equal distance from previous prime (1243854135077) and next prime (1243854135101).

It can be written as a sum of positive squares in only one way, i.e., 705843621025 + 538010514064 = 840145^2 + 733492^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243854135089 - 2²⁰ = 1243853086513 is a prime.

It is a super-2 number, since 2×1243854135089² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1243854135089.

It is not a weakly prime, because it can be changed into another prime (1243854131089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621927067544 + 621927067545.

It is an arithmetic number, because the mean of its divisors is an integer number (621927067545).

Almost surely, 2^{1243854135089} is an apocalyptic number.

It is an amenable number.

1243854135089 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243854135089 is an equidigital number, since it uses as much as digits as its factorization.

1243854135089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4147200, while the sum is 53.

The spelling of 1243854135089 in words is "one trillion, two hundred forty-three billion, eight hundred fifty-four million, one hundred thirty-five thousand, eighty-nine".