1243530451199 has 4 divisors (see below), whose sum is σ = 1251159472536. Its totient is φ = 1235901429864.

The previous prime is 1243530451169. The next prime is 1243530451201. The reversal of 1243530451199 is 9911540353421.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1243530451199 - 2¹⁶ = 1243530385663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243530451169) 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, 3814510424 + ... + 3814510749.

It is an arithmetic number, because the mean of its divisors is an integer number (312789868134).

Almost surely, 2^{1243530451199} is an apocalyptic number.

1243530451199 is a deficient number, since it is larger than the sum of its proper divisors (7629021337).

1243530451199 is an equidigital number, since it uses as much as digits as its factorization.

1243530451199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7629021336.

The product of its (nonzero) digits is 583200, while the sum is 47.

The spelling of 1243530451199 in words is "one trillion, two hundred forty-three billion, five hundred thirty million, four hundred fifty-one thousand, one hundred ninety-nine".