123531545121005 has 24 divisors (see below), whose sum is σ = 172441081410912. Its totient is φ = 84706790811552.

The previous prime is 123531545120969. The next prime is 123531545121007. The reversal of 123531545121005 is 500121545135321.

It is not a de Polignac number, because 123531545121005 - 2²² = 123531540926701 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123531545121005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123531545121007) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37777994 + ... + 40917476.

It is an arithmetic number, because the mean of its divisors is an integer number (7185045058788).

Almost surely, 2^{123531545121005} is an apocalyptic number.

It is an amenable number.

123531545121005 is a deficient number, since it is larger than the sum of its proper divisors (48909536289907).

123531545121005 is a wasteful number, since it uses less digits than its factorization.

123531545121005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3300105 (or 3300098 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 38.

The spelling of 123531545121005 in words is "one hundred twenty-three trillion, five hundred thirty-one billion, five hundred forty-five million, one hundred twenty-one thousand, five".