123444135413 has 4 divisors (see below), whose sum is σ = 123883438668. Its totient is φ = 123004832160.

The previous prime is 123444135391. The next prime is 123444135517. The reversal of 123444135413 is 314531444321.

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

It can be written as a sum of positive squares in 2 ways, for example, as 49828507729 + 73615627684 = 223223^2 + 271322^2 .

It is a cyclic number.

It is not a de Polignac number, because 123444135413 - 2⁶ = 123444135349 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 (123444134413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219651206 + ... + 219651767.

It is an arithmetic number, because the mean of its divisors is an integer number (30970859667).

Almost surely, 2^123444135413 is an apocalyptic number.

It is an amenable number.

123444135413 is a deficient number, since it is larger than the sum of its proper divisors (439303255).

123444135413 is an equidigital number, since it uses as much as digits as its factorization.

123444135413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439303254.

The product of its digits is 69120, while the sum is 35.

Adding to 123444135413 its reverse (314531444321), we get a palindrome (437975579734).

The spelling of 123444135413 in words is "one hundred twenty-three billion, four hundred forty-four million, one hundred thirty-five thousand, four hundred thirteen".