1243043231455 has 4 divisors (see below), whose sum is σ = 1491651877752. Its totient is φ = 994434585160.

The previous prime is 1243043231453. The next prime is 1243043231459. The reversal of 1243043231455 is 5541323403421.

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

It is not a de Polignac number, because 1243043231455 - 2¹ = 1243043231453 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 (1243043231453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124304323141 + ... + 124304323150.

It is an arithmetic number, because the mean of its divisors is an integer number (372912969438).

Almost surely, 2^{1243043231455} is an apocalyptic number.

1243043231455 is a deficient number, since it is larger than the sum of its proper divisors (248608646297).

1243043231455 is an equidigital number, since it uses as much as digits as its factorization.

1243043231455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248608646296.

The product of its (nonzero) digits is 172800, while the sum is 37.

Adding to 1243043231455 its reverse (5541323403421), we get a palindrome (6784366634876).

The spelling of 1243043231455 in words is "one trillion, two hundred forty-three billion, forty-three million, two hundred thirty-one thousand, four hundred fifty-five".