1243507254641 has 2 divisors, whose sum is σ = 1243507254642. Its totient is φ = 1243507254640.

The previous prime is 1243507254599. The next prime is 1243507254659. The reversal of 1243507254641 is 1464527053421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 928023955600 + 315483299041 = 963340^2 + 561679^2 .

It is an emirp because it is prime and its reverse (1464527053421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1243507254641 - 2¹⁴ = 1243507238257 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1243507254592 and 1243507254601.

It is not a weakly prime, because it can be changed into another prime (1243507254841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621753627320 + 621753627321.

It is an arithmetic number, because the mean of its divisors is an integer number (621753627321).

Almost surely, 2^{1243507254641} is an apocalyptic number.

It is an amenable number.

1243507254641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243507254641 is an equidigital number, since it uses as much as digits as its factorization.

1243507254641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 806400, while the sum is 44.

The spelling of 1243507254641 in words is "one trillion, two hundred forty-three billion, five hundred seven million, two hundred fifty-four thousand, six hundred forty-one".