1243002041545 has 12 divisors (see below), whose sum is σ = 1639529966340. Its totient is φ = 904001484320.

The previous prime is 1243002041537. The next prime is 1243002041549. The reversal of 1243002041545 is 5451402003421.

It can be written as a sum of positive squares in 2 ways, for example, as 535398060681 + 707603980864 = 731709^2 + 841192^2 .

It is not a de Polignac number, because 1243002041545 - 2³ = 1243002041537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1243002041549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1027273810 + ... + 1027275019.

It is an arithmetic number, because the mean of its divisors is an integer number (136627497195).

Almost surely, 2^{1243002041545} is an apocalyptic number.

It is an amenable number.

1243002041545 is a deficient number, since it is larger than the sum of its proper divisors (396527924795).

1243002041545 is a wasteful number, since it uses less digits than its factorization.

1243002041545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2054548856 (or 2054548845 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 31.

Adding to 1243002041545 its reverse (5451402003421), we get a palindrome (6694404044966).

The spelling of 1243002041545 in words is "one trillion, two hundred forty-three billion, two million, forty-one thousand, five hundred forty-five".