123542706541 has 4 divisors (see below), whose sum is σ = 127802799900. Its totient is φ = 119282613184.

The previous prime is 123542706491. The next prime is 123542706583. The reversal of 123542706541 is 145607245321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 145607245321 = 139 ⋅1047534139.

It can be written as a sum of positive squares in 2 ways, for example, as 82179688900 + 41363017641 = 286670^2 + 203379^2 .

It is a cyclic number.

It is not a de Polignac number, because 123542706541 - 2⁹ = 123542706029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123542706494 and 123542706503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123542706641) 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, 2130046636 + ... + 2130046693.

It is an arithmetic number, because the mean of its divisors is an integer number (31950699975).

Almost surely, 2^123542706541 is an apocalyptic number.

It is an amenable number.

123542706541 is a deficient number, since it is larger than the sum of its proper divisors (4260093359).

123542706541 is an equidigital number, since it uses as much as digits as its factorization.

123542706541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4260093358.

The product of its (nonzero) digits is 201600, while the sum is 40.

The spelling of 123542706541 in words is "one hundred twenty-three billion, five hundred forty-two million, seven hundred six thousand, five hundred forty-one".