1243204133401 has 4 divisors (see below), whose sum is σ = 1245279600000. Its totient is φ = 1241128666804.

The previous prime is 1243204133383. The next prime is 1243204133447. The reversal of 1243204133401 is 1043314023421.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1243204133401 - 2¹⁷ = 1243204002329 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1243204133401.

It is not an unprimeable number, because it can be changed into a prime (1243204133471) 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 3 ways as a sum of consecutive naturals, for example, 1037732401 + ... + 1037733598.

It is an arithmetic number, because the mean of its divisors is an integer number (311319900000).

Almost surely, 2^{1243204133401} is an apocalyptic number.

It is an amenable number.

1243204133401 is a deficient number, since it is larger than the sum of its proper divisors (2075466599).

1243204133401 is an equidigital number, since it uses as much as digits as its factorization.

1243204133401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2075466598.

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 1243204133401 its reverse (1043314023421), we get a palindrome (2286518156822).

The spelling of 1243204133401 in words is "one trillion, two hundred forty-three billion, two hundred four million, one hundred thirty-three thousand, four hundred one".