123135240543 has 16 divisors (see below), whose sum is σ = 188302400256. Its totient is φ = 70112589120.

The previous prime is 123135240511. The next prime is 123135240551. The reversal of 123135240543 is 345042531321.

It is not a de Polignac number, because 123135240543 - 2⁵ = 123135240511 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123135240583) 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 15 ways as a sum of consecutive naturals, for example, 10427521 + ... + 10439322.

It is an arithmetic number, because the mean of its divisors is an integer number (11768900016).

Almost surely, 2^123135240543 is an apocalyptic number.

123135240543 is a deficient number, since it is larger than the sum of its proper divisors (65167159713).

123135240543 is a wasteful number, since it uses less digits than its factorization.

123135240543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20867134.

The product of its (nonzero) digits is 43200, while the sum is 33.

Adding to 123135240543 its reverse (345042531321), we get a palindrome (468177771864).

The spelling of 123135240543 in words is "one hundred twenty-three billion, one hundred thirty-five million, two hundred forty thousand, five hundred forty-three".